2AZQL-RANGEEXTENDERRange Extender

Long-range communication bridge for Smart Monster pressure sensors Range Extender The Range Extender is a long-range communication bridge for use with Smart Monster devices. To begin, download and install the Smart Monster mobile application available on both iOS and Android devices. When you first launch the Smart Monster mobile application, you willl be prompted to allow the application to use bluetooth communication, and on Android, to also access location data. These are required for the application to communicate with the Smart Monster devices. The mobile application will automatically discover any Smart Monster or Range Extender within communication range (approximately 25 feet), and begin displaying the pressure reading right away. About your Range Extender Your Range Extender has an antenna on end for long-range communication. The antenna may be removed for storage, but should be replaced for best operation before using. The Range Extender uses 915 Mhz ISM band communication to relay readings from your Smart Monster devices over a mesh network, allowing you to use your Smart Monster from distances greater than 25 feet, as well as through obstructions such as interior and exterior building walls. Your Range Extender has wireless charging capabilities. To charge the battery, simply place it on a wireless charge pad with wireless charge cap facing down (the antenna pointing up). The Range Extender should reach a full charge within 4-8 hours. It is recommended to charge them nightly, though you should get several days use out of a full charge. Communication AntennaWireless Charging Cap A Smart Monster which is out of bluetooth range of your mobile phone may be used through range extenders. Place one near your Smart Monster device, and one near your smart phone. To span greater distances, you may place additional smart monsters at intermediate locations between the two Smart Monsters that are only discoverable through the Range Extender network will appear with a status of ‘remote’. Tap on any device in the list to switch to its Device Options screen. On the Device Options screen, you can set the Hose Monster product it is connected to, which will switch the reading shown from PSI to Gallons Per Minute (GPM). Return to the Device Options screen and clear your selection to return to PSI values. There is no device calibration screen available when a Smart Monster is ‘remote’. Typical Deployment FCC Compliance 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. CAUTION: The grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. Such modifications 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. This equipment has been tested and meets applicable limits for radio frequency (RF) exposure. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

Hydro Flow Products, LLC 1330 Ensell Road Lake Zurich, IL 60047 Date: 05/17/22 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2AZQL-RANGEEXTENDER Confidentiality Request To whom it may concern, Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of the information accompanying this application as outlined below: ☒Block Diagram ☐Tune-Up Information ☒Operational Description ☐Security Information ☒Schematics ☐Software Defined Radio (SDR) Information ☒Parts List The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these matters might be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Rule 0.457, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Signature: Michael Tobey CEO

Hydro Flow Products, LLC 1330 Ensell Road Lake Zurich, IL 60047 Date: 05/17/22 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2AZQL-RANGEEXTENDER Declaration of Authorization To whom it may concern, I, the undersigned, hereby authorize, Jandy So, of Waltek Testing Group (Shenzhen) Co., Ltd., (WALTEK) to act on our behalf in all manners relating to application for equipment authorization, including signing of all documents relating to these matters. Any and all acts carried out by Jandy So, of Waltek Testing Group (Shenzhen) Co., Ltd., (WALTEK) on our behalf shall have the same effects as acts of our own. I, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C 853(a). This authorization is valid until further written notice from the applicant. Sincerely, Signature: Michael Tobey CEO

Reference No.: WTX22X02015947W Page 2 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn EXHIBIT 2 - EUT EXTERNAL PHOTOGRAPHS EUT View 1 EUT View 2 Reference No.: WTX22X02015947W Page 3 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn EUT View 3 EUT View 4 Reference No.: WTX22X02015947W Page 4 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn EUT View 5 EUT View 6

Reference No.: WTX22X02015947W Page 1 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn ANNEX EXHIBIT 1 - PRODUCT LABELING Proposed FCC ID Label Format Specifications: The label shall be securely affixed to a permanently attached part of the device, in a location where it is visible or easily accessible to the user, and shall not be readily detachable. The label shall be sufficiently durable to remain fully legible and intact on the device in all normal conditions of use throughout the device’s expected lifetime. Proposed Label Location on EUT FCC ID Label Location

Reference No.: WTX22X02015947W Page 5 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn EXHIBIT 3 - EUT INTERNAL PHOTOGRAPHS EUT Housing and Board View 1 EUT Housing and Board View 2 Reference No.: WTX22X02015947W Page 6 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn EUT Housing and Board View 3 Solder Board-Component View 1 Reference No.: WTX22X02015947W Page 7 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Solder Board-Component View 2 Solder Board-Component View 3 Reference No.: WTX22X02015947W Page 8 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Solder Board-Component View 4 Solder Board-Component View 5 Reference No.: WTX22X02015947W Page 9 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Antenna View 1 Antenna View 2

RF Exposure Requirements Product Description: Range Extender Model No.: RE001 FCC ID: 2AZQL-RANGEEXTENDER According to the KDB 447498 D01 v06 section 4.3.1, for 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 Calculation Result: For Bluetooth: Tx frequency range: 2402-2480MHz Min. test separation distance: 5mm Maximum Conducted Output Power: 1.661dBm Tune-Up output power: 2.0 dBm RF channel transmit frequency: 2402MHz Result: 0.5 Limit: 3.0 For SRD: Tx frequency range: 915MHz Min. test separation distance: 5mm Maximum Conducted Output Power: 6.16dBm Tune-Up output power: 6.5dBm RF channel transmit frequency: 915MHz Result: 0.9 Limit: 3.0 The exclusion thresholds is 0.5+0.9=1.4 < 3, so the transmitter complies with the RF exposure requirements and the SAR is not required.

Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 1 of 29 TEST REPORT Reference No. .................... : WTX22X02015947W-2 FCC ID ................................ : 2AZQL-RANGEEXTENDER Applicant ........................... : Hydro Flow Products, LLC Address ............................. : 1330 Ensell Rd., Lake Zurich, IL 60047 Manufacturer ..................... : The same as Applicant Address ............................. : The same as Applicant Product Name ................... : Range Extender Model No.. .......................... : RE001 Standards .......................... : FCC Part 15.247 Date of Receipt sample .... : 2022-02-10 Date of Test........................ : 2022-02-10 to 2022-05-11 Date of Issue ..................... : 2022-05-17 Test Report Form No. ....... : WTX_Part 15_247W Test Result ......................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of approver. Prepared By: Waltek Testing Group (Shenzhen) Co., Ltd. Address: 1/F., Room 101, Building 1, Hongwei Industrial Park, Liuxian 2nd Road, Block 70 Bao'an District, Shenzhen, Guangdong, China Tel.: +86-755-33663308 Fax.: +86-755-33663309 Email: [email protected] Tested by: Approved by: Mike Shi Silin Chen Reference No.: WTX22X02015947W-2 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 2 of 29 TABLE OF CONTENTS 1. GENERAL INFORMATION ................................................................................................................................... 4 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ............................................................................... 4 1.2 TEST STANDARDS ................................................................................................................................................... 5 1.3 TEST METHODOLOGY ............................................................................................................................................. 5 1.4 TEST FACILITY ....................................................................................................................................................... 5 1.5 EUT SETUP AND TEST MODE ................................................................................................................................. 6 1.6 MEASUREMENT UNCERTAINTY .............................................................................................................................. 7 1.7 TEST EQUIPMENT LIST AND DETAILS ..................................................................................................................... 8 2. SUMMARY OF TEST RESULTS ......................................................................................................................... 10 3. ANTENNA REQUIREMENT ................................................................................................................................ 11 3.1 STANDARD APPLICABLE ....................................................................................................................................... 11 3.2 EVALUATION INFORMATION ................................................................................................................................ 11 4. POWER SPECTRAL DENSITY ........................................................................................................................... 12 4.1 STANDARD APPLICABLE ....................................................................................................................................... 12 4.2 TEST SETUP BLOCK DIAGRAM ............................................................................................................................. 12 4.3 TEST PROCEDURE ................................................................................................................................................. 12 4.4 SUMMARY OF TEST RESULTS/PLOTS .................................................................................................................... 12 5. DTS BANDWIDTH ................................................................................................................................................. 13 5.1 STANDARD APPLICABLE ....................................................................................................................................... 13 5.2 TEST SETUP BLOCK DIAGRAM ............................................................................................................................. 13 5.3 TEST PROCEDURE ................................................................................................................................................. 13 5.4 SUMMARY OF TEST RESULTS/PLOTS .................................................................................................................... 13 6. RF OUTPUT POWER ............................................................................................................................................ 14 6.1 STANDARD APPLICABLE ....................................................................................................................................... 14 6.2 TEST SETUP BLOCK DIAGRAM ............................................................................................................................. 14 6.3 TEST PROCEDURE ................................................................................................................................................. 14 6.4 SUMMARY OF TEST RESULTS/PLOTS .................................................................................................................... 14 7. FIELD STRENGTH OF SPURIOUS EMISSIONS .....................................................…

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Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 1 of 35 TEST REPORT Reference No. .................... : WTX22X02015947W-1 FCC ID ................................ : 2AZQL-RANGEEXTENDER Applicant ........................... : Hydro Flow Products, LLC Address ............................. : 1330 Ensell Rd., Lake Zurich, IL 60047 Manufacturer ..................... : The same as Applicant Address ............................. : The same as Applicant Product Name ................... : Range Extender Model No.. .......................... : RE001 Standards .......................... : FCC Part 15.247 Date of Receipt sample .... : 2022-02-10 Date of Test........................ : 2022-02-10 to 2022-03-18 Date of Issue ..................... : 2022-03-18 Test Report Form No. ....... : WTX_Part 15_247W Test Result ......................... : Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of approver. Prepared By: Waltek Testing Group (Shenzhen) Co., Ltd. Address: 1/F., Room 101, Building 1, Hongwei Industrial Park, Liuxian 2nd Road, Block 70 Bao'an District, Shenzhen, Guangdong, China Tel.: +86-755-33663308 Fax.: +86-755-33663309 Email: [email protected] Tested by: Approved by: Mike Shi Silin Chen Reference No.: WTX22X02015947W-1 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Page 2 of 35 TABLE OF CONTENTS 1. GENERAL INFORMATION ................................................................................................................................... 4 1.1 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ............................................................................... 4 1.2 TEST STANDARDS ................................................................................................................................................... 5 1.3 TEST METHODOLOGY ............................................................................................................................................. 5 1.4 TEST FACILITY ....................................................................................................................................................... 5 1.5 EUT SETUP AND TEST MODE ................................................................................................................................. 6 1.6 MEASUREMENT UNCERTAINTY .............................................................................................................................. 7 1.7 TEST EQUIPMENT LIST AND DETAILS ..................................................................................................................... 8 2. SUMMARY OF TEST RESULTS ......................................................................................................................... 10 3. ANTENNA REQUIREMENT ................................................................................................................................ 11 3.1 STANDARD APPLICABLE ....................................................................................................................................... 11 3.2 EVALUATION INFORMATION ................................................................................................................................ 11 4. POWER SPECTRAL DENSITY ........................................................................................................................... 12 4.1 STANDARD APPLICABLE ....................................................................................................................................... 12 4.2 TEST SETUP BLOCK DIAGRAM ............................................................................................................................. 12 4.3 TEST PROCEDURE ................................................................................................................................................. 12 4.4 SUMMARY OF TEST RESULTS/PLOTS .................................................................................................................... 12 5. DTS BANDWIDTH ................................................................................................................................................. 13 5.1 STANDARD APPLICABLE ....................................................................................................................................... 13 5.2 TEST SETUP BLOCK DIAGRAM ............................................................................................................................. 13 5.3 TEST PROCEDURE ................................................................................................................................................. 13 5.4 SUMMARY OF TEST RESULTS/PLOTS .................................................................................................................... 13 6. RF OUTPUT POWER ............................................................................................................................................ 14 6.1 STANDARD APPLICABLE ....................................................................................................................................... 14 6.2 TEST SETUP BLOCK DIAGRAM ............................................................................................................................. 14 6.3 TEST PROCEDURE ................................................................................................................................................. 14 6.4 SUMMARY OF TEST RESULTS/PLOTS .................................................................................................................... 14 7. FIELD STRENGTH OF SPURIOUS EMISSIONS .....................................................…

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Reference No.: WTX22X02015947W Page 10 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn EXHIBIT 4 - TEST SETUP PHOTOGRAPHS Radiation Emission Test Setup (Below 30MHz) Radiation Emission Test Setup (30MHz to 1GHz) Reference No.: WTX22X02015947W Page 11 of 11 Waltek Testing Group (Shenzhen) Co., Ltd. Http://www.waltek.com.cn Radiation Emission Test Setup (1GHz to 18GHz) Radiation Emission Test Setup (Above 18GHz) ***** END OF REPORT *****