YZZGWN7670EDual-Band Wi-Fi 7 Access Point

Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Email: [email protected] Attestation Letter Date: 2026-04-10 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir or Madam: Our product Dual-Band Wi-Fi 7 Access Point, Model number: GWN7670E, FCC ID: YZZGWN7670E, For use in the US market, this product only support 2.4G Wi- Fi (2412-2462MHz, 802.11b/g/n20/n40/ax20/ax40/be20/be40 modes), 5G Wi-Fi (5150- 5250MHz; 5250-5350MHz; 5470-5725MHz; 5725-5850MHz; 5850-5895MHz; 802.11a/n20/n40/ac20/ac40/ac80/ac160/ax20/ax40/ax80/ax160/be20/be40/be80/be160 modes). The other functions, bands and modes were disabled to use by manufacture in the software, and for 802.11ax/be mode, it only supports full RU configuration not partial RU, the partial RU was also disabled by software, the end user has no capability to activate it. Sincerely, Signature Junwei Wang VP of HW Engineering

Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Email: [email protected] CFR 47 §2.911(d)(5)(i) Attestation Letter Attestation Letter Date: 2026-04-10 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(i) Filing FCC ID: YZZGWN7670E Grandstream Networks, Inc. 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, Signature: Contact Person: Junwei Wang VP of HW Engineering

Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Email: [email protected] CFR 47 §2.911 (d)(5)(ii) Attestation Letter Attestation Letter Date: 2026-04-10 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(ii) Filing FCC ID: YZZGWN7670E Grandstream Networks, Inc. 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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, Signature: Contact Person: Junwei Wang VP of HW Engineering

U.S. AGENT LETTER OF ATTESTATION Date: 2026-04-10 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(7) Filing FCC ID: YZZGWN7670E Grandstream Networks, Inc. certifies that, as of the date of the filing of the application, Grandstream Networks, Inc. is our designated U.S. agent for service of process for the above referenced FCC ID. Grandstream Networks, Inc. accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Grandstream Networks, Inc. accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent and Applicant Information: Name: Grandstream Networks, Inc. Address: 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA FRN: 0020352431 Tel.: 1-617-5669300 Email: [email protected] Signed by (printed name): Junwei Wang Signature:

Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Email: [email protected] QA-FR-170-B 7/29/2014 FCC Authorization Date: 2026-04-10 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern: We Grandstream Networks, Inc., the undersigned, hereby authorizes Bay Area Compliance Laboratories Corp. (Shenzhen) to act on its behalf in all matters relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by Bay Area Compliance Laboratories Corp. (Shenzhen) on our behalf shall have the same effect as our own action. We, 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. 862. This authorization is valid until further written notice from the applicant. Sincerely Yours, Signature: Junwei Wang VP of HW Engineering

Grandstream Networks, Inc. 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Email: [email protected] FCC Confidential Authorization Date: 2026-04-10 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: YZZGWN7670E In accordance with Sections 0.457 and 0.459 of the Commission’s Rules, Grandstream Networks, Inc. hereby requests long-term confidential treatment of information accompanying this application as outlined below:  Block Diagram  Schematics  Operation Description  Parts List  Software Security Description As well as short-term confidential treatment of information accompanying this application for a period of 45 days after grant is issued as outlined below:  Internal Photos  User’s Manual  External Photos  Test Set-up Photos The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely Yours, Signature: Junwei Wang VP of HW Engineering

Bay Area Compliance Laboratories Corp. (Shenzhen) Project No.: 2601P12244E-RF FCC ID LABEL AND LOCATION FCC ID Label FCC ID Label Location Information The label shown shall be permanently affixed at a conspicuous location on the device and be readily visible to the user at the time purchase (Labeling requirements per 2.925)

Bay Area Compliance Laboratories Corp. (Shenzhen) Report No.: 2601P12244E-RFB TR-EM-RF015 Page 402 of 407 Version 4.1 RF EXPOSURE EVALUATION MPE-Based Exemption Applicable Standard According to subpart 15.247(i)and subpart §1.1310, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091) (B) Limits for General Population/Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Averaging Time (minutes) 0.3–1.34 614 1.63 *(100) 30 1.34–30 824/f 2.19/f *(180/f²) 30 30–300 27.5 0.073 0.2 30 300–1500 / / f/1500 30 1500–100,000 / / 1.0 30 f = frequency in MHz; * = Plane-wave equivalent power density; According to §1.1310 and §2.1091 RF exposure is calculated. Result Calculation formula: Prediction of power density at the distance of the applicable MPE limit S = PG/4πR² = power density (in appropriate units, e.g. mW/cm 2 ); P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm); For simultaneously transmit system, the calculated power density should comply with: Bay Area Compliance Laboratories Corp. (Shenzhen) Report No.: 2601P12244E-RFB TR-EM-RF015 Page 403 of 407 Version 4.1 Calculated Data: For worst case: Mode Frequency (MHz) Antenna Gain # Max Tune-up Power # Evaluation Distance (cm) Power Density (mW/cm 2 ) MPE Limit (mW/cm 2 ) (dBi) (numeric)(dBm)(mW) 2.4G Wi-Fi 2412-2462 6.77 4.75 28.5 707.9530 0.2975 1.0 5G Wi-Fi 5150-5250 10.46 11.12 23 199.5330 0.1963 1.0 5250-5350 10.46 11.12 22 158.4930 0.1559 1.0 5470-5725 10.46 11.12 20 100.0030 0.0984 1.0 5725-5850 10.46 11.12 25.5 354.8130 0.3490 1.0 5850-5895 10.46 11.12 24 251.1930 0.2471 1.0 Note: 1) The tune up conducted power and antenna gain was declared by the applicant. 2) The antenna gain should be the directional gain. 3) The 2.4G Wi-Fi and 5G Wi-Fi can simultaneous transmitting. Simultaneous transmitting consideration (worst case): The ratio=MPE 2.4G Wi-Fi /limit+MPE 5G Wi-Fi /limit = 0.2975/1.0+0.3490/1.0 =0.647<1.0, so simultaneous exposure is compliant. To maintain compliance with the FCC’s RF exposure guidelines, place the equipment at least 30cm from nearby persons. Result: Compliant

1 / 3 GWN7670E天线技术规格书 Antenna Specification Brand Name: GRANDSTREAM Manufacture: SHENZHEN CHAOLIU NETWORK TECHNOLOGIES CO., LTD Manufacturing address：14th Floor, Building-C, Coolpad Building, Gaoxin North District, Science Park, Nanshan District, Shenzhen Product Number（or model Nanme）: 118-00220-00 Specification and Interface 频率范围Frequency（MHz） 2.4G:2400～2500 5G：5150～5895 电压驻波比VSWR ≦2.0：1 峰值增益Peak Gain（dBi） 2G0：3.86 2G1：3.65 5G0：5.73 / 5G1：5.85 5G2：5.48 隔离度Isolation ≦-17dB 天线类型Type PIFA Antenna 辐射方向Radiation Properties 全向Omni-directional 最大输入功率Max Input Power(Watts) 2 阻抗Impedance（Ohms） 50 工作温度Operation Temperature -40°C to 85°C 储存温度Storage Temperature -40°C to 85°C 相对湿度Relative Humidity 40% to 95% 环保认证ROHS Compliant 通过Yes 2.4G Antenna Radiation Patterns(unit:dB) 2 / 3 5G Antenna Radiation Patterns(unit:dB) 3 / 3 总成图Mechanical Drawing(unit:mm) ▲规格书到此结束END OF THE SPECIFICATION.