2AZ3JE50Environmental Sensor

FCC/ISED FCC/ISED

Grantee also Agent for Service of Process_FCC_Attestation Statements_Kiwa Page 1 of 2 RF_754_02 15-02-2023 U.S. Agent Designation for Service of Process (Applicant is Both Grantee and U.S. Agent) TO: Kiwa Nederland B.V. Wilmersdorf 50 7327 AC Apeldoorn Postbus 137 7300 AC Apeldoorn Netherlands ATTENTION: FCC Certification – Section 2.911(d)(7) Information This letter is to confirm that the Applicant will also serve as the U.S. Agent for Service of Process as required by 47 CFR 2.911(d)(7). The Applicant acknowledges that they must maintain an agent for no less than one year after terminating all marketing and importation OR the conclusion of any Commission-related proceeding involving the equipment. The Applicant further acknowledges their responsibility to inform the FCC whenever the Designated U.S. Agent information changes. Applicant & Agent Company name: Rhombus Systems, Inc FRN: 0030968606 Grantee Code: 2AZ3J Contact person name: Dave Gustafson Agent name: Dave Gustafson Street address: 1920 20th Street ZIP/City/State Sacramento Telephone number: (650) 269-7258 Email address: [email protected] Signature Contact person*: Date: 22 July 2024 Signature Agent*: Date: 22 July 2024 Grantee also Agent for Service of Process_FCC_Attestation Statements_Kiwa Page 2 of 2 RF_754_02 15-02-2023 Note *Must be signed by both the applicant, and agent on behalf Revision Record Sheet: Revision Section number Page number Date Remark(s) issued by 01 09-02-2023 1 st version RvM 02 1 15-02-2023 Added FRN RvdM Issued/modified by : Richard van de Meer Function : Certification assessor Revision : 02 Date : 15-02-2023 Verified by : Willem Jan Jong Function : Team Lead Date : 16-02-2023 Released by : Axel Gase Function : Manager Quality Assurance Date of release: : 19-02-2023

Covered list attestation FCC application letter Kiwa Page 1 of 2 RF_755_02 15-02-2023 Certification Application Attestation Statements Rhombus Systems, Inc 1920 20th Street CA 95811 Sacramento, United States Subject: FCC ID: 2AZ3JE50 To Whom It May Concern: Statement for 47 CFR section 2.911(d)(5)(i) Rhombus Systems, Inc certifies that as of the date of the application the equipment for which authorization is sought is not “covered” equipment 1 prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, including affiliates or subsidiaries of the named companies, the applicant must include an explanation on why the equipment is not “covered” equipment. Additional Explanation: <N/A> Statement for 47 CFR section 2.911(d)(5)(ii) Rhombus Systems, Inc (“the applicant”) certifies that, as of the date of the filing of this application, the applicant - is / - is not (3) identified on the Covered List as an entity producing “covered” equipment. Date: 22 July 2024 City: Sacramento Name (2) : Dave Gustafson Function: Vice President of Hardware Telephone number: (650) 269-7258 Email address: [email protected] Signature: Revision Record Sheet: 1 - The Commission’s Covered List is published by the Public Safety and Homeland Security Bureau and posted on the Commission’s website. This Covered List, which is periodically updated, identifies particular equipment, produced by particular entities, that constitutes “covered” equipment. https://www.fcc.gov/supplychain/coveredlist . (2): For FCC it must be the Grantee Code “owner” or the authorized agent. (3): double click on the appropriate box and select ‘’checked” then “OK” Covered list attestation FCC application letter Kiwa Page 2 of 2 RF_755_02 15-02-2023 Revision Section number Page number Date Remark(s) issued by 01 07-02-2023 1 st version RvM 02 1 15-02-2023 Changed Applicant to Company and added “Subject: FCC ID: “ RvdM Issued/modified by : Richard van de Meer Function : Certification assessor Revision : 02 Date : 15-02-2023 Verified by : Willem Jan Jong Function : Team Lead Date : 16-02-2023 Released by : Axel Gase Function : Manager Quality Assurance Date of release: : 19-02-2023

RF_160_05 Declaration of Authorisation Date of issue 02-01-2023 Declaration of Authorization We Name: Rhombus Systems, Inc Address: 1920 20th Street City: Sacramento, CA 95811 Country: United States Declare that: Name Representative of agent: Gary Wu (1) Agent Company name: Wendell Industrial Co., Ltd. Address: 1F, No. 119, Wugong 3rd Rd., Wugu Dist. City: New Taipei City Country Taiwan R.O.C. is authorized to apply for Certification of the following product(s): Product description: Environmental Sensor Type designation: E50 Trademark: Rhombus Validity/ expiry date on our behalf. Date: 22 July 2024 City: Sacramento Name: Dave Gustafson (2) Function: Vice President of Hardware Signature: ............................... Notes: (1): Required for FCC application (2): For FCC it must be the Grantee Code “owner” or the authorized agent. Revision Record Sheet: Revision Section number Page number Date Remark(s) issued by 02 1 02-01-2023 History sheet added AG Issued/modified by : Axel Gase Function : Quality Manager Revision : 02 Date : 02-01-2023 Verified by : Willem Jan Jong Function : Team Lead Date : 02-01-2023 Released by : Axel Gase Function : Manager Quality Assurance Date of release: : 02-01-2023

FCC, Request for non-disclosure Date: 23-06-2023 RF_501, Issue 11 Page 1 of 2 Company Name: Rhombus Systems, Inc Address : 1920 20th Street City: Sacramento, CA 95811 Country: United States To: Kiwa Netherlands B.V., Dept. FCC TCB Wilmersdorf 50 7327 AC Apeldoorn The Netherlands Subject: Request for confidentiality FCC ID: 2AZ3JE50 Reference number: ###### Dear FCC TCB, 1. Long-Term Confidentiality Pursuant to 47 CFR Section 0.459(a) & (b), we hereby requests non-disclosure and confidential treatment of the following materials submitted in support of FCC certification application: Bill(s) of Material Block Diagrams Operational Description Schematic Diagrams Tune-up Procedure Above materials contain secrets, proprietary and technical information, which would customarily be guarded from competitors under 47 CFR, section 0.457(d)(2). Disclosure or publication or any portion of this company confidential material to other parties could cause substantial competitive harm and provide unjustified benefits for competitors. 2. Short-Term Confidentiality (STC) Pursuant to Public Notice DA 04-1705 of the Commission’s policy, in order to comply with the marketing regulations in 47 CFR §2.803 and the importation rules in 47 CFR §2.1204, a pplicant hereby requests Short-Term Confidential treatment of the following materials (See notes below): Internal Photos User’s Manual Test Set-up Photos External Photos Justification: Date: 22 July 2024 Name and signature of applicant: Dave Gustafson Notes: 1) A document or type of document can only have ONE type of confidentiality! 2) Short-Term confidentiality is in principle for 45 days from date of grant; it can be extended max 3 times (total time 180 days max.)! The planned date should state in the RF731 application form. 3) FCC must be informed when marketing begins earlier. 4) Release takes place automatically thus extension must be requested in time. Telefication does not remind you of this! 5) Request for extension or for release must be received by Kiwa NL B.V. at least 7 days before date of actual marketing or before expiration of the STC period FCC, Request for non-disclosure Date: 23-06-2023 RF_501, Issue 11 Page 2 of 2 Revision Record Sheet: Revision Section number Page number Date Remark(s) issued by 10 1 02-01-2023 History sheet added AG 11 1 & 2 23-06-2023 Corrected date and page# WJJ Issued/modified by : Willem Jan Jong Function : Team Lead Revision : 11 Date : 23-06-2023 Verified by : Axel Gase Function : Manager Quality Assurance Date : 23-06-2023 Released by : Axel Gase Function : Manager Quality Assurance Date of release: : 23-06-2023

Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 1 of 5 Attachment 2：EUT Detailed Photographs Photo 1 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 2 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 2 of 5 Photo 3 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 4 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 3 of 5 Photo 5 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 6 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 4 of 5 Photo 7 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 8 (Accessories_ LEAK DET Cable) Trade Name：GOLDEN BRIDGE ELECTECH INC. Model Name：HK-KHGJ-0051 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 5 of 5 Photo 9 (Accessories_ LEAK DET Cable) Trade Name：GOLDEN BRIDGE ELECTECH INC. Model Name：HK-KHGJ-0049 --- END ---

單位主管檢查人彙編人 DOP電子簽核N/A 楊秀慧 適用成品： 文件編號：S-VDA0X5-RBUS-XX01 VDA0X5-RBUS 產品包裝作業規格書 品號品名 VIO107100008AIR-MONITOR E50 VDA0X5-RBUS 晶睿通訊股份有限公司 修訂日期版本變 更 內 容 修訂人員 24.07.1501 新發行楊秀慧 文件履歷表 目 錄 文件編號 S-VDA0X5-RBUS-XX01 日期 2024/07/15 文件名稱 產品包裝作業規格書_VDA0X5-RBUS系列 頁次 1/4 1.標籤欄位及黏貼說明....................................2 A.VDA0X0-RBUS.....................................2 3包裝說明.............................4.外箱標籤黏貼位置及 2產品包裝..............................................3 晶睿通訊股份有限公司 產標 A1. 標籤說明 ■ 產品測試OK後才貼上產品標籤，如圖示。 ■ 檢視測試程式MAC序號是否與標籤相同。 ■ 包裝盒貼紙MAC須與主機上的號碼一致。 標籤欄位說明 MODEL－E50 S/N－ E50-YYMMNNNN(前三碼為客戶型號) YY: 年 MM: 月 NNNN: 流水號 0001 - 9999 MAC－使用RBUS客戶自家編碼共12碼 Carton ID－E50-XXXXXX-YYWW E 50 : 前 碼為客戶型號 三 XXXXXX: 16進位流水號 YYWW: ⻄元年後2碼+生產週別 以上數據條碼使用Code 128製做 ※ a. b. c. d. A1-2. 外盒標籤 P/N：3205050600 60*30mm ■ 貼在工業紙盒右側面右下角黏貼框線中，位置如下圖示。 A1-1. 產品標籤 P/N：3205049500 75*37.5mm ■ 在產組底部黏貼，黏貼位置如下圖示。 A1-3. 外箱標籤 P/N：3260980300 103*153mm 文件編號 S-VDA0X5-RBUS-XX01 日期 2024/07/15 文件名稱 產品包裝作業規格書_VDA0X5-RBUS系列 頁次 2/4 1. 標籤欄位及黏貼說明 A.VDA0X5-RBUS 晶睿通訊股份有限公司 文件編號 S-VDA0X5-RBUS-XX01 日期 2024/07/15 文件名稱 產品包裝作業規格書_VDA0X5-RBUS系列 頁次 3/4 1.工業彩盒 2.紙漿內襯 3.螺絲配件組 4. PE袋 5. 產品組合 6.安裝定位孔貼紙 7. 產品說明卡 此為內襯右下角物品 7 3 2 5 8 9 2. 產品包裝 1 內襯放入包裝盒 示意圖 此為內襯中間物品 4 5 產組以側面方向放入PE袋， 袋口用透明膠帶封口。 單盒包裝內容說明： ■ 請依BOM表包裝正確產組, 紙盒, 螺絲配件組, 安裝定位孔貼紙。 螺絲配件組 此為紙盒及內襯間隙中物品 13 14 1.文件如下圖插放入盒襯中 2.再朝向自己半折平放盒中 ，文件不可超過左右盒蓋 晶睿通訊股份有限公司 紙盒間縫隙，需使 用氣泡布填滿。 上層4pcs 下層6pcs 2. 外箱標籤黏貼位置及包裝說明 P/N：708020200G ■ 紙盒放入時： 上層-開口朝上放 4 台 / 下層-開口側放 6 台 ■ ■ 每一外箱放置10台。 ■ 紙箱寬面左側位置貼上側嘜貼紙，(約上距5cm/左距2.5cm) 一箱各貼2 pcs，位置如下圖示。 ■ ■ 封箱時請注意須將紙箱蓋片封緊，避免蓋片浮高。 ■ 裁：533X297X361 mm ■ 外：538X303X375 mm 400mm 358mm 467mm 文件編號 S-VDA0X5-RBUS-XX01 日期 2024/07/15 文件名稱 產品包裝作業規格書_VDA0X5-RBUS系列 頁次 4/4 3. 外箱標籤黏貼位置及包裝說明 P/N：3510597400 ■ 紙盒放入時外盒標籤朝上方向一致，上下各8pcs ，每一外箱放置 16 台。 ■ 外箱騎縫處在右上方時，為外箱的正面， ■ 紙箱窄面左下位置貼上側嘜貼紙，一箱共貼2 pcs (約下距5cm/左距2.5cm)，位置如下圖示。 ■ 封箱時請注意須將紙箱蓋片封緊，避免蓋片浮高。 361mm 297mm 533mm 8pcs 外箱騎縫處在右上方 正面 8pcs

Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 1 of 15 Attachment 2：EUT Detailed Photographs Photo 1 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 2 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 2 of 15 Photo 3 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 4 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 3 of 15 Photo 5 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 6 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 4 of 15 Photo 7 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 8 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 5 of 15 Photo 9 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 10 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 6 of 15 Photo 11 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 12 Trade Name：Rhombus Systems, Inc. Model Name：E50 RF Chip Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 7 of 15 Photo 13 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 14 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 8 of 15 Photo 15 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 16 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 9 of 15 Photo 17 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 18 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 10 of 15 Photo 19 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 20 Trade Name：Rhombus Systems, Inc. Model Name：E50

Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 11 of 15 Photo 21 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 22 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 12 of 15 Photo 23 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 24 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 13 of 15 Photo 25 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 26 Trade Name：Rhombus Systems, Inc. Model Name：E50 Antenna Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 14 of 15 Photo 27 Trade Name：Rhombus Systems, Inc. Model Name：E50 Photo 28 Trade Name：Rhombus Systems, Inc. Model Name：E50 Antenna Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 15 of 15 Photo 29 Trade Name：Rhombus Systems, Inc. Model Name：E50 --- END ---

Report No: WD-RF-R-240201-B0 Page 1 of 10 FCC MPE Evaluation Report Report No: WD-RF-R-240201-B0 Product Name : Environmental Sensor Model Name : E50 FCC ID : 2AZ3JE50 Applicant : Rhombus Systems, Inc. Received Date : Jun. 19, 2024 Tested Date : Jul. 01, 2024 ~ Jul. 15, 2024 Applicable Standard : 47 CFR FCC Part 2.1091 47 CFR FCC Part 1.1310 KDB 447498 D01 OET Bulletin 65 Supplement C Wendell Industrial Co., Ltd Wendell EMC & RF Laboratory Caution: This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or representative of the quality or characteristics of the lot from which a test sample was taken or any similar or identical product unless specifically and expressly noted. The test results shown in the test report are traceable to the national/international standard through the calibration report of the equipment. Please note that the measurement uncertainty are provided for informational purpose only and are not used in determining the Pass/Fail results. This report must not be used to claim product endorsement by TAF or any agency of the government. The test report shall not be reproduced without the written approval of Wendell Industrial Co., Ltd.. Report No: WD-RF-R-240201-B0 Page 2 of 10 Test Report Issued Date: July 16, 2024 Project No.: 24Q061901 Product Name Environmental Sensor Trade Name Rhombus Systems, Inc. Model Name E50 FCC ID 2AZ3JE50 Applicant Rhombus Systems, Inc. Manufacturer VIVOTEK INC. EUT Rated Voltage PoE：37V ~ 57V EUT Test Voltage PoE：56V EUT Supports Radios Application Bluetooth LE Applicable Standard 47 CFR FCC Part 2.1091 47 CFR FCC Part 1.1310 KDB 447498 D01 OET Bulletin 65 Supplement C RF Evaluation 0.00349 mW/cm 2 Test Result Complied Documented : ( Specialist / Emma Lu ) Technical Engineer : ( Section Manager / Jack Chang ) Approved : ( Project Manager / Gary Wu ) Report No: WD-RF-R-240201-B0 Page 3 of 10 Table of Contents Document Revision History ................................................................................................................. 4 Reference Testing Standard ................................................................................................................. 5 1 Generation Information .............................................................................................................. 6 1.1 Applicant .................................................................................................................................... 6 1.2 Manufacturer ............................................................................................................................. 6 1.3 Description of Equipment under Test ...................................................................................... 6 1.4 Test Facility ................................................................................................................................ 7 2 Mobile device Assessment Procedure ......................................................................................... 8 3 RF Exposure Assessment ............................................................................................................. 8 4 Limit Requirement ...................................................................................................................... 9 5 Test Results ................................................................................................................................. 10 Report No: WD-RF-R-240201-B0 Page 4 of 10 Document Revision History Report No. Issue date Description WD-RF-R-240201-B0 July 16, 2024 Initial report Report No: WD-RF-R-240201-B0 Page 5 of 10 Reference Testing Standard Standard Description Version 47 CFR FCC Part 2.1091 Radiofrequency radiation exposure evaluation: mobile devices. -- 47 CFR FCC Part 1.1310 Radiofrequency radiation exposure limits. -- KDB 447498 D01 RF Exposure procedures and equipment authorization policies for mobile and portable devices. V06 OET Bulletin 65 Supplement C Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields. Edition 01-01 Report No: WD-RF-R-240201-B0 Page 6 of 10 1 Generation Information 1.1 Applicant Rhombus Systems, Inc. 1920 20th Street, Sacramento, CA 95811 1.2 Manufacturer VIVOTEK INC. 5F, No.168, Lien-Cheng Rd., Chung-Ho , New Taipei City, 235, Taiwan, R.O.C. 1.3 Description of Equipment under Test Product Name Environmental Sensor Model No. E50 FCC ID 2AZ3JE50 Frequency Range 2402 ~ 2480 MHz Antenna Information Refer to the table “Antenna List” The above equipment was tested by Wendell EMC & RF Laboratory For compliance with the requirements set forth in 47 CFR § 2.1091 / 47 CFR § 1.1310. The results of testing in this report apply only to the product/system, which was tested. Other similar equipment will not necessarily produce the same results due to production tolerance and measurement uncertainties Antenna List No. Manufacturer Model No. Antenna Type Peak Gain 1 Wanshih Electronic Co., Ltd. E50_WPC064 Mini 1.13(Black) 2.4GHz Antenna with MHF L50mm PIFA Antenna 3.5 dBi for 2.4GHz Report No: WD-RF-R-240201-B0 Page 7 of 10 1.4 Te s t Facility Items Required (IEC 60068-1) Temperature (°C) 15-35 Humidity (% RH) 25-75 Barometric pressure (mbar) 860-1060 Description: Accredited by TAF Accredited Number: 2965 Issued by: Wendell Industrial Co., Ltd Company Address: 6F/6F-1, No.188, Baoqiao Rd., Xindian Dist., New Taipei City 23145, Taiwan R.O.C Test Lab: Wendell EMC & RF Laboratory Lab Address: 5F-1, No.188, Baoqiao Rd., Xindian Dist., New Taipei City 23145, Taiwan R.O.C Test Location: No. 119, Wugong 3rd Rd., Wugu Dist., New Taipei City 248, Taiwan (R.O.C.) Designation Number: TW0025 Test Firm Registration Number: 665221 Report No: WD-RF-R-240201-B0 Page 8 of 10 2 Mobile device Assessment Procedure In 47 CFR § 2.1091, a mobile device is defined as a transmitting device designed to be used i…

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承 認 書 SPECIFICATION FOR APPROVAL 客 戶 CUSTOMER 日 期 DATE 品 名 DESCRIPTION 客 戶 料 號 CUSTOMER P/N 成 品 編 號 Part NO. 萬旭電業股份有限公司 Wanshih Electronic Co., Ltd. 新北市五股區新北產業園區五工六路72號4樓 4F 72 Wu Kong 6th Rd., Wugu Dist., New Taipei Industrial Park, New Taipei City 24891, Taiwan(R.O.C.) TEL：886-2-2298-8066 FAX：886-2-2298-1102 晶睿通訊股份有限公司 2023/11/27 SO1WFI0030A E50_WPC064 Mini 1.13(Black) 2.4GHz Antenna with MHF L50mm Antenna proposal Antenna Proposal Wireless Function  2.4G Antenna type  PIFA Specification and Measurement data Implement data Return Loss < 15 dB VSWR <1.4 Efficiency > 50% Bottom To p Efficiency 50% Peak Gain < 4 dBi Operating 40 °C ～ +80 °C Mt St t Temperature - 40 °C ～ +80 °C M easuremen t St ruc t ure www.wanshih.com.tw Antenna placement FPCB ： 40 * 17 * 02Tmm FPCB ： 40 17 0 . 2Tmm Tape ： 3M9888T Cable ： 1.13 normal L50 mm Connector ： IPEX MHF-1L www.wanshih.com.tw Measurement data-S-parameter S-parameter : S11(GHz) S11 S11(GHz) S11 2.400GHz -23.54 2.450GHz -37.76 2.500GHz -20.05 Return Loss table(Unit: dB) www.wanshih.com.tw Measurement data-Radiation pattern Radiation pattern ‐ DUT orientation setting Y X Z (Horn) Z(Horn) www.wanshih.com.tw Measurement data-Radiation pattern X-Z plane (Phi=0 °) Y-Z plane (Phi=90 °) X-Y plane (Theta=90 °) X Y Y Z X Z Y X Y X 2.4 GHz 2.45 GHz 2.5 GHz www.wanshih.com.tw Measurement data-Gain table Gain table : Frequency (MHz) 2400 2450 2500 Peak Gain (dBi) 3.48 3.50 3.66 Avg. Gain (dBi) -2.81 -2.64 -2.72 Efficiency (%) 52.36 54.45 53.46 www.wanshih.com.tw

Report No: WD-RF-R-240201-A0 Page 1 of 51 FCC Test Report Report No: WD-RF-R-240201-A0 Product Name : Environmental Sensor Model Name : E50 FCC ID : 2AZ3JE50 Applicant : Rhombus Systems, Inc. Received Date : Jun. 19, 2024 Tested Date : Jul. 01, 2024 ~ Jul. 15, 2024 Applicable Standard : 47 CFR FCC Part 15, Subpart C (Section 15.247) KDB 558074 D01 DTS Meas. Guidance v05 ANSI C63.10 : 2013 Wendell Industrial Co., Ltd Wendell EMC & RF Laboratory Caution: This report sets forth our findings solely with respect to the test samples identified herein. The results set forth in this report are not indicative or representative of the quality or characteristics of the lot from which a test sample was taken or any similar or identical product unless specifically and expressly noted. The test results shown in the test report are traceable to the national/international standard through the calibration report of the equipment. Please note that the measurement uncertainty are provided for informational purpose only and are not used in determining the Pass/Fail results. This report must not be used to claim product endorsement by TAF or any agency of the government. The test report shall not be reproduced without the written approval of Wendell Industrial Co., Ltd.. Report No: WD-RF-R-240201-A0 Page 2 of 51 Test Report Issued Date: July 16, 2024 Project No.: 24Q061901 Product Name Environmental Sensor Trade Name Rhombus Systems, Inc. Model Name E50 FCC ID 2AZ3JE50 Applicant Rhombus Systems, Inc. Manufacturer VIVOTEK INC. EUT Rated Voltage PoE：37V ~ 57V EUT Test Voltage PoE：56V EUT Supports Radios Application Bluetooth LE Applicable Standard 47 CFR FCC Part 15, Subpart C (Section 15.247) KDB 558074 D01 DTS Meas. Guidance v05 ANSI C63.10 : 2013 Output Power 8.94 dBm Test Result Complied Documented : ( Specialist / Emma Lu ) Technical Engineer : ( Section Manager / Jack Chang ) Approved : ( Project Manager / Gary Wu ) Report No: WD-RF-R-240201-A0 Page 3 of 51 Table of Contents Document Revision History ................................................................................................................. 5 Summary of Test Result ....................................................................................................................... 6 1 Generation Information .............................................................................................................. 7 1.1 Applicant .................................................................................................................................... 7 1.2 Manufacturer ............................................................................................................................. 7 1.3 Description of Equipment under Test ...................................................................................... 7 1.4 Test Mode Applicability And Tested Channel Detail .......................................................... 10 1.5 Configuration of Tested System ............................................................................................. 12 1.6 EUT Exercise Software ........................................................................................................... 13 1.7 Tested System Details .............................................................................................................. 13 1.8 Test Facility .............................................................................................................................. 14 1.9 Measurement Uncertainty ...................................................................................................... 15 1.10 List of Test Equipment ............................................................................................................ 16 2 Test Result .................................................................................................................................. 20 2.1 Antenna Requirement ............................................................................................................. 20 2.1.1 Applicable Standard .......................................................................................................... 20 2.1.2 Antenna Connected Construction ..................................................................................... 20 2.1.3 Antenna Gain .................................................................................................................... 20 2.2 Peak Output Power Measurement ......................................................................................... 21 2.2.1 Limit ................................................................................................................................. 21 2.2.2 Test Setup .......................................................................................................................... 21 2.2.3 Test Procedure................................................................................................................... 21 2.2.4 Test Result ........................................................................................................................ 21 2.3 6dB Bandwidth Measurement ................................................................................................ 22 2.3.1 Limit ................................................................................................................................. 22 2.3.2 Test Setup .......................................................................................................................... 22 2.3.3 Test Procedure................................................................................................................... 22 2.3.4 Test Result ........................................................................................................................ 23 2.4 Power Spectral Density Measurement ................................................................................... 24 2.4.1…

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Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 1 of 3 Attachment 1：EUT Test Photographs AC Conducted Emission Trade Name：Rhombus Systems, Inc. Model Name：E50 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 2 of 3 Radiated Emission for 30 M ~ 1 GHz Trade Name：Rhombus Systems, Inc. Model Name：E50 Trade Name：Rhombus Systems, Inc. Model Name：E50 Report No: WD-RF-R-240201-A0 WD-RF-R-240201-B0 Page 3 of 3 Radiated Emission for above 1 GHz Trade Name：Rhombus Systems, Inc. Model Name：E50 Trade Name：Rhombus Systems, Inc. Model Name：E50 --- END ---