1. 2.5mm 3.5mm 2 prong K1 connector, compatible with Baofeng Kenwood Retevis 2-pin walkie talkies. 2. Flexiable neckband, suit for most size necks, with anti-slip sweatproof tape, comfortable for wearing. 3. High quality audio. Clear sound with no muffled no leaking no distortion. 4. Advance bone conduction technology. Sensitive throat vibration detecting microphone can transmit the communication clearly. 5. This laryngophone throat mic headset is friendly to fast moving outdoor activitiesm=, like skiing, cycling, bike, climbing, running. It is also nice for surveillance purposes and security at casinos,airports,paintball,police,crowd control at conventions and concerts, nightclubs, bars, paintball,and restaurants, hotels, bouncer, warehouses, party, building construction, stage, studio, hunting, outdoor and noisy environments. Compatible Model Compatible with RETEVIS:RT21 RT22 H-777 RT68 RT27 RT-5R,RT-B6,R888s Plus,RT-5R,RT-B6,RT-5RV,RT1,RT2,RT5 Compatible with Kenwood KPG:KPG27D,KPG29D,KPG48D,KPG49,KPG55D,KPG56D,KPG62D,KPG66D,KPG69D,KPG70D,KPG74D,KPG75D,KPG77D,KPG82D Compatible with Kenwood TH:TH-D7,TH-D7A,TH-D7AG,TH-D7E,TH-F6,TH-F6A,TH-F7,TH-F7E,TH-G71,TH-G71A,TH-G71E,TH-K2,TH-K2A,TH-K2E,TH-K2ET,TH-21,TH-21AT,TH-21BT,TH-22,Th-22A,TH-22At,TH-22E,TH-25,TH-26,TH-27 for Kenwood TK:TK-208/308,TK-220/320,TK-240/340,TK-240D/340D,TK-248/348,TK-250/350/353,TK-260/360,TK-260G/360G,TK-270/370,TK-270G/370G,TK-272G/372G/373G,TK-278G/378G/388GPro-Talk Compatible with Baofeng:UV5R,UV8,UV8D,UVB5,UVB6,A52 ,UV5RA,UV5RC,UV5RD,UV5RE,UV5RE+,UV-5RX3 UV-5R+,UV-5X3,F8,F8+,UV-82 UV-X9,BF-V9,UV-B9,A-52(II),BF-UVB3 Plus,GT-3,DM-5R Plus BF-999/888/777/666s/777s/888s/F8+/A5/388A Compatible with TIDRADIO TD-H5 TD-H6 etc; Compatible with Arcshell AR-5; Compatible with TYT:TH-F8 ,TH-UVF8D,TH-UVF9D,TH-UV8000D/E,MD-380,MD-390 and so on Compatible with HYT:TC286/386/2685/3865/6685/278/378/388/2100/2088 Compatible with WOUXUN:WOUXUN,KG-UV8D,UV6D,UVD1PUV-899 Compatible with QUSHENG Compatible with LINTON Compatible with TYT etc