Description :  Walkie Talkie Helmet Speaker and Microphone System  Specifications :  Color : Black Material : Plastic + rubber Easy to install with Velcro tape Cable length : 142cm Comes with connection cable (240cm)  Microphone :  Impedance : 2.2k ohms @ 1KHz 2.0V Sensitivity : -42 +\/- 3dB Frequency response : 20Hz~20KHz Working voltage : DC 1~10V  Speaker : Impedance : 32 ohms Sensitivity : 114dB +\/- 3dB Rated input power : 10mW Max input power : 20mW  Compatible with : Universal for K-connector walkies talkies. Baofeng : UV-5R Series， UV-B Series etc Kenwood TK-3107 \/ TK-3207 \/ TK2107 \/ TK2207 \/ TK-308 \/ TK-208 \/ TK-3118 \/ TK-2118 QuanSheng TG-UV2 \/ TG-K4AT \/ TG-45A \/ TG-46AT \/ TG-42A \/ TG-3118 \/ TG-6118 PuXing PX-777 \/ VEV-3288S \/ LT-6600 \/ LT-6288 \/ LT-6100PLUS WouXun KG-679\/689\/669\/801\/803 \/ KG-UVD1P  Package included :  1 x Helmet Speaker and Microphone System 1 x connection cable  Details pictures :