Throat mic is a type of contact microphone that absorbs vibrations directly from your throat worn against the neck. So you can keep in touch with your teammates even when helmets or respiratory protection is required. It also can pick up speech even in extremely noisy or windy environments, such as on a motorcycle or in a nightclub. Adjustable Size Everyone has a different neck.So this adjustable headset allows everyone to find their own comfortable size. Transparent Tube Soft earbuds with ergonomic design allows super comfort wearing, and it fits well in ears for blocking noise even in noise background. With the K connector; that work with most radios. Two-pin standard diameter: Ear 3.5mm stereo (top pin). Mic 2.5mm stereo (bottom pin); Space of two-pin: 11mm Compatible for: Retevis:H-777/RT21/RT22/RT15/RT17/RT18/RT19/ RT23/RT26/RT27/RT28/RT43/RT46/RT50/RT52/RT53/RT56/RT67/RT68/RT71/RT76/RT80/RT81 Baofeng:UV-5R Series, BF-F8HP, UV-82 Series, UV-82C, UV-82H, BF-480/490/320/V6/520/530/999/888/666S/BF-888S and more Arcshell AR-5/AR-6 Fit Kenwood: TH-F6/F6A/D7/D7A/D7AG/D7E/F7/F7E/G71/G71A TH-G71E/K2/K2A/K2E/K2ET/21/21AT/21BT/22 TH-22A/22AT/22E/25/26/27/28/31AT/31BT/41AT/41BT TH-42/42A/42AT/2E/45/46/47/48/55/75/77/G71 TH-205/-215/225/235/235A/235E/315/41 TK-208/220/240/240D/248/250/260/260G/270/270G/308 TK-360G/370/370G/372G/373G/320/340/340D/348/350 TK-378/378G/430/431/353/360 TK-2100/ 2102/2130/2160/3100/3101/3102/3107/ TK-3118/3130/3131/3160 etc Fit Linton: LT-2288/3288/6288/5288/3188/2188/3260/2268/3268,/6288/6188/3288A Fit HYT: TC286 386 2685 3865 6685/TC 278 378 388 What's in box: 1 x ETK003 Kenwood Throat Control Headset