RVU-A4LEPortable Thermal Printer

FCC Caution： This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -Reorient or relocate the receiving antenna. -Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

SHENZHENZIJIANGELECTRONICSCO., LTD U.S. Agent Designationfor Serviceof Process (Applicantand U.S. Agent are SeparateParties) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA ATTENTION: FCC Certification – Section 2.911(d)(7) Information Designated U.S. Agent Company Name: SELLER HELPER INC. FRN: 0033406737 Contact Name: Fairy Lee Address: 1312 17th Street # 1298 ， Denver ， CO 80202 ， United States Telephone No: 01303-7319873 Email: [email protected] This letter is to confirmthat we (“the DesignatedU.S. Agent)have acceptedthe responsibilityto act as the DesignatedU.S. Agent for Serviceof Processas requiredby section47 CFR 2.911(d)(7)on behalf of the Applicantnoted below. U.S. Agent Signature: Date: Signedby (PrintedName/Title): The Applicantacknowledgesthat they must maintainan agent for no less than one year after terminatingall marketingand importationOR the conclusionof any Commission-relatedproceedinginvolvingthe equipment.The applicantfurtheracknowledgestheir responsibilityto informthe FCC wheneverthe DesignatedU.S. Agent informationabove changes. Applicant Companyname:SHENZHENZIJIANGELECTRONICSCO., LTD FRN:0022375208 FCC ID: RVU-A4LE Email:[email protected] ContactName:GongHaiWang Address:4 Floor of No.2 Buildingof DonglongxingSciencePark, HuaningRoad, DalangStreet, LonghuaDistrict,Shenzhen,China,518110 TelephoneNo: +86-755-29005719 ApplicantSignature: Date: 202 4.8.15 Signedby (PrintedName/Title):GongHaiWang/ Manager

SHENZHEN ZIJIANG ELECTRONICS CO., LTD 2024.08.15 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for FCC ID: RVU-A4LE [SHENZHEN ZIJIANG ELECTRONICS CO., LTD] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, (Applicant signature) (Applicant printed name) GongHai Wang SHENZHEN ZIJIANG ELECTRONICS CO., LTD 2024.08.15 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for FCC ID: RVU-A4LE [SHENZHEN ZIJIANG ELECTRONICS CO., LTD] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) GongHai Wang

SHENZHEN ZIJIANG ELECTRONICS CO., LTD 2024.08.15 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Portable Thermal Printer Trademark: N/A MODEL : A4LE FCC ID : RVU-A4LE To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the - Block Diagram - Schematics - Operational Description required to be submitted with this application be permanently withheld from public review. The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : GongHai Wang / General Manager Contact information / address: 4 Floor of No.2 Building of Donglongxing Science Park, Huaning Road, Dalang Street, Longhua District, Shenzhen, China, 518110

SHENZHEN ZIJIANG ELECTRONICS CO., LTD 2024.08.15 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing Co., Ltd to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Client’s signature: Client’s name / title : GongHai Wang / General Manager Contact information / address: 4 Floor of No.2 Building of Donglongxing Science Park, Huaning Road, Dalang Street, Longhua District, Shenzhen, China, 518110

Report No.: BCTC2406741643E External Photos Report No.: BCTC2406741643E Report No.: BCTC2406741643E Report No.: BCTC2406741643E Report No.: BCTC2406741643E

Size:40*20mm Portable Thermal Printer FCC ID: RVU-A4LE This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Label location

Report No.: BCTC2406741643E Internal Photos Report No.: BCTC2406741643E Report No.: BCTC2406741643E Report No.: BCTC2406741643E Antenna Report No.: BCTC2406741643E Report No.: BCTC2406741643E Report No.: BCTC2406741643E Report No.: BCTC2406741643E Report No.: BCTC2406741643E

RF EXPOSURE EVALUATION METHOD FCC ID: RVU-A4LE Applicable standard： In accordance with FCC 47 CFR part 2 (2.1093) this device has been defined as a portable device which is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. Portable devices must be evaluated using the specified in FCC 47 CFR part 2 (2.1093) and ANSI/IEEEC95.1-1992. and had been tested in accordance with the measurement methods and procedures specified in IEEE 1528-2003. Per FCC KDB 447498 D01 v06, the 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances s 50 mm are determined by: SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR,where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. Condition Mode Frequency (MHz) Conducted Power (dBm) Limit (dBm) RVerdict NVNT BLE 1M 2402 2.61 30 Pass NVNT BLE 1M 2440 1.53 30 Pass NVNT BLE 1M 2480 0.25 30 Pass NVNT BLE 2M 2402 2.3 30 Pass NVNT BLE 2M 2440 1.44 30 Pass NVNT BLE 2M 2480 0.12 30 Pass max possible output power (PK,conducted)：2±1dBm 3dBm=2mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2/5*√2.402=0.62≤3.0 2440MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2/5*√2.44=0.625≤3.0 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 2/5*√2.48=0.63≤3.0 Conclusion: 1. [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] * [√f(GHz)] < 3.0. 2. SAR Test Exclusion Thresholds is 3.0 for separation distance 5mm. Therefore, SAR test is not required.

OTA TEST REPORT TA Tech nology (Shanghai) Co., Ltd. tested the above equipment in accordance with the requirements in ANSI/IEEE Std 149-2008. The test results show that the equipment tested is capable of demonstrating compliance with the requirements as documented in this report. Prep ared by: Peng Tao App roved by: Kai Xu TA Technology (Shanghai) Co., Ltd. No.145, Jintang Rd, Tangzhen Industry Park, Pudong Shanghai, China TEL: +86‐021‐50791141/2/3 FAX: +86‐021‐50791141/2/3‐8000 Applicant Espressif System (Shanghai) Co.,Ltd Product ESP32-C3-WROOM-02 Model ESP-ANT B Report No. Y2102A0260-T3 Issue Date March 9, 2021 OTA Test Report Report No: Y2102A0260-T3 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 2 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. TABLE OF CO NTENTS 1.Test Laboratory .............................................................................................................................. 3 1.1. Notes of the Test Report ................................................................................................... 3 1.2. Test facility ........................................................................................................................ 3 1.3. Testing Location ................................................................................................................ 3 1.4. Laboratory Environment .................................................................................................... 4 2.General Description of Equipment under Test ............................................................................... 5 2.1. Applicant and Manufacturer Information ............................................................................ 5 2.2. General information ........................................................................................................... 5 2.3. Test Date ........................................................................................................................... 5 2.4. Receiving Date .................................................................................................................. 5 2.5. Applied Standards ............................................................................................................. 6 3.Test Conditions .............................................................................................................................. 7 3.1. Test Configuration ............................................................................................................. 7 3.2. Test Measurement ............................................................................................................. 7 4.Test Results ................................................................................................................................... 8 4.1. Gain and Efficiency ............................................................................................................ 8 5.Equipment List ............................................................................................................................... 9 ANNEX A 3-D Pattern Plots ................................................................................................................... 10 ANNEX B：The EUT Appearance and Test Configuration ...................................................................... 12 B.1 EUT Appearance ................................................................................................................... 12 B.2 Test Configuration ................................................................................................................. 13 OTA Test Report Report No: Y2102A0260-T3 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 3 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. 1.Test Laboratory 1.1. Notes of the Test Report This report shall not be reproduced in full or partial, without the written approval of TA technology (shanghai) co., Ltd. The results documented in this report apply only to the tested sample, under the conditions and modes of operation as described herein .Measurement Uncertainties were not taken into account and are published for informational purposes only. This report is written to support regulatory compliance of the applicable standards stated above. 1.2. Test facility A2LA (Certificate Number: 3857.01) TA Technology (Shanghai) Co., Ltd. has been listed by American Association for Laboratory Accreditation to perform measurement. 1.3. Testing Location Company: TA Technology (Shanghai) Co., Ltd. Address: No.145, Jintang Rd, Tangzhen Industry Park, Pudong Shanghai, China City: Sh ang hai P ost code: 201201 Country: P. R. China Contact: Xu Ka i Telep hone: +86-021-50791141/2/ 3 Fax:+86- 021-50791141/2/3-8000 Website: http://www.ta-shanghai.com E-mail: xu [email protected] OTA Test Report Report No: Y2102A0260-T3 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 4 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. 1.4. Laboratory Environment Temperature Min. =19°C，Max. = 25°C Relative humidity Min. =40%，Max. =72% Shield effect 0.7-6GHz >100dB Ground resistance <0.5 OTA Test Report Report No: Y2102A0260-T3 TA Technology (Shanghai) Co., Ltd. TA-MB-04-008O P age 5 of 13 This report shall not be reproduced except in full, without the written approval of TA Technology (Shanghai) Co., Ltd. 2. General Description of Equipment under Test 2.1. Applicant and Manufacturer Information Applicant Name Espressif System (Shanghai) Co.,Ltd Applicant address Suite 204 Block 2, 690 Bibo Road, Zhang Jiang Hi-Tech Park, Shanghai, China Manufacturer Name Espressif System (Shanghai) Co.,Ltd Manufacturer address Suite 204 Block 2, 690 Bibo Road, Zhang Jiang Hi-Tech Park, Shanghai, China 2…

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No.：BCTC/RF-EMC-005 Page: 1 of 53 Edition：B.2 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2406741643E Applicant: SHENZHEN ZIJIANG ELECTRONICS CO., LTD Product Name: Portable Thermal Printer Test Model: A4LE Tested Date: 2024-06-17 to 2024-08-06 Issued Date: 2024-08-06 Report No.: BCTC2406741643E No.：BCTC/RF-EMC-005 Page: 2 of 53 Edition：B.2 FCC ID: RVU-A4LE The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: Portable Thermal Printer Trademark: N/A Model/Type reference: A4LE Prepared For: SHENZHEN ZIJIANG ELECTRONICS CO., LTD Address: 4 Floor of No.2 Building of Donglongxing Science Park, Huaning Road, Dalang Street, Longhua District, Shenzhen, China, 518110 Manufacturer: SHENZHEN ZIJIANG ELECTRONICS CO., LTD Address: 4 Floor of No.2 Building of Donglongxing Science Park, Huaning Road, Dalang Street, Longhua District, Shenzhen, China, 518110 Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2024-06-17 Sample tested Date: 2024-06-17 to 2024-08-06 Issue Date: 2024-08-06 Report No.: BCTC2406741643E Test Standards: FCC Part15.247 ANSI C63.10-2013 Test Results: PASS Remark: This is Bluetooth BLE radio test report. Tested by: Approved by: Lei Chen/Project Handler Zero Zhou/Reviewer Report No.: BCTC2406741643E No.：BCTC/RF-EMC-005 Page: 3 of 53 Edition：B.2 Table Of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information And Test Setup ..................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 9 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ............................................................................................................. 9 4.6 Table Of Parameters Of Text Software Setting ................................................... 10 5. Test Facility And Test Instrument Used ............................................................... 11 5.1 Test Facility ......................................................................................................... 11 5.2 Test Instrument Used .......................................................................................... 11 6. Conducted Emissions .......................................................................................... 13 6.1 Block Diagram Of Test Setup .............................................................................. 13 6.2 Limit .................................................................................................................... 13 6.3 Test Procedure ................................................................................................... 13 6.4 EUT Operating Conditions .................................................................................. 13 7. Radiated Emissions ............................................................................................. 16 7.1 Block Diagram Of Test Setup .............................................................................. 16 7.2 Limit .................................................................................................................... 17 7.3 Test Procedure ................................................................................................... 18 7.4 EUT Operating Conditions .................................................................................. 19 7.5 Test Result .......................................................................................................... 19 8. Radiated Band Emission Measurement And Restricted Bands Of Operation ..... 24 8.1 Block Diagram Of Test Setup .............................................................................. 24 8.2 Limit .................................................................................................................... 24 8.3 Test Procedure ................................................................................................... 25 8.4 EUT operating Conditions ................................................................................... 25 8.5 Test Result .......................................................................................................... 26 9. Power Spectral Density Test ............................................................................... 27 9.1 Block Diagram Of Test Setup .............................................................................. 27 9.2 Limit .................................................................................................................... 27 9.3 Test Procedure ................................................................................................... 27 9.4 EUT Operating Conditions .................................................................................. 27 9.5 Test Result ..................................…

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Report No.: BCTC2406741643E No.：BCTC/RF-EMC-005 Page: 51 of 53 Edition：B.2 15. EUT Test Setup Photographs Conducted emissions Photo Radiated Measurement Photos Report No.: BCTC2406741643E No.：BCTC/RF-EMC-005 Page: 52 of 53 Edition：B.2