FCC ID: YZZGUV3000 USB Corded Headset

3 2 1 Headset Components 1 Receiver 2 Ear cushion 3 Click-stop headband 4 Flexible microphone boom 4 5 Clothing clip 5 6 6 Noise-canceling microphone 7 USB housing 7 Buons and lights 1 Display for mute microphone 2 Mute microphone 3 Volume control 4 Hook On/Off key 5 Display for Hook Off 1 2 3 4 5 Using Your Headset 1.Connect your GUV3000 Headset to a free USB port on your PC. 2.Make sure that the headset has been selected as the standard audio device in the system control audio settings. 3.Check whether you need to adjust these settings to use a headset. Le or Right Wearing Style The GUV3000 can be worn on the left or right by flipping the microphone to the other side (300 limit). To change ears, rotate the microphone boom over the head-

band to accommodate the left or right ear.

1

2 GUV3000 USB Corded Headset

Posion the Microphone

Adjust the Headband How to Use Display for mute microphone Volume up Hook On/Off Key Display for Hook Off Place the headset receiver to your ears. Adjust the head-

band until it is comfortable, ideally ensuring that there is virtually no pressure felt on the ears. How to Care for Your Headset 1.Always store the headset with the power off and safely protected. 2.Avoid storage at extreme temperatures (above 25C/77F or below -20C/-4F). This may adversely affect the headset. Mute microphone Volume down FUNCTION ACTION Answer/End call Tap the Answer/End button Reject call Double-tap the button Adjust volume Tap the Volume up or Volume down button Mute the micro-

phone Tap the mute microphone but-

ton Call light on/off Tap the Answer/End button, Blue light on

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor Boston, MA 02215 USA Voice: (617) 566-9300 Fax: (617) 249-1987 www.grandstream.com To avoid low or distorted sound, and to provide clear and crisp telephone calls, the microphone should be positioned within 30-40mm of your mouth. The microphone boom arm will move in a variety of directions to ensure the best fit. Mute on/off When mute, Red light on

For Certification, Warranty and RMA information, please visit www.grandstream.com 3 4

Reference e No.: WTX20 0X06038437 7W EXHIBI T 1 - PRO ODUCT L LABELIN NG Proposed FCC ID La abel Forma at shall be secu cessible to th legible and in urely affixed t he user, and ntact on the to a permane shall not be device in all ently attached readily detac l normal cond d part of the d chable. The l ditions of use device, in a lo label shall be e throughout ocation where e e sufficiently y t the devices s ns: The label or easily acc emain fully l etime. Specification it is visible durable to r expected life Proposed Label Loca ation on EU UT FCC ID Label Lo cation Waltek Tes http://www sting Group w.semtest.co

(Shenzhen) m.cn Co., Ltd.

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor, Massachusetts, United States July 3, 2020 FEDERAL COMMUNICATIONS COMMISSION AUTHORIZATION AND EVALUATION DIVISION 7435 OAKLAND MILLS ROAD COLUMBIA, MD 21046 We, the undersigned hereby declare, that the following radio equipment:

Product name: USB Corded Headset Fcc ID : YZZGUV3000 Model No. : GUV3000 is electrically equal to the original equipment:

Product name : VT Series Headsets Fcc ID : 2AC67-xX100 Date of Grant: 07/03/2020 Model No. : X100 DUO The EUT are electronically/electrically identical to the original equipment, and that the original test results continue to be representative of and applicable LG ity BEST REGARDS, Grandstream Networks, Inc. BQH} Lee

(Ning Wei)

(Manager)

Xiamen VBeT Electronics Co., Ltd. N403, Weiye Building, Xiamen Pioneering Park for Overseas Chinese Scholars, PRC July 3, 2020 FEDERAL COMMUNICATIONS COMMISSION AUTHORIZATION AND EVALUATION DIVISION 7435 OAKLAND MILLS ROAD COLUMBIA, MD 21046 SUBJECT: FCCID: 2AC67-X100 TO WHOM IT MAY CONCERN:

BEING THE APPLICANT FOR THE ABOVE MENTIONED FCC IDENTIFIER, WE HEREBY AUTHORIZE Grandstream Networks, Inc. AT 126 Brookline Ave, 3rd Floor, Massachusetts, United States TO APPLY FOR FCC MULTIPLE LISTING FOR THEIR MODEL: GUV3000, FCCID:

YZZGUV3000 WILL BE. THEY WISH TO MARKET THIS PRODUCT U DER THEIR OWN COMPANY NAME.

x BEST REGARDS, Xiamen VBeT Electronics Co., Ltd.

(Victor Fan)

(Manager)

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor, Massachusetts, United States

(FCC ID: ZZGUV3000) POWER OF ATTORNEY DATE: 2020-07-03 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern:

We, the undersigned, hereby authorize Waltek Testing Group (Shenzhen) Co., Ltd. Jandy $o on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by Waltek Testing Group (Shenzhen) Co., Ltd. Jandy So on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti-Drug Abuse Act. We, Grandstream Networks, Inc. are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Sincerely, Grandstream Networks, Inc. a) Ute

(Ning Wei)

(Manager)