Clear sound; 2 way radio headset with sensitive mic to pick up clear nature sound for smooth transmitting; no distortion or attenuation Acoustic tube; covert acoustic headset makes calls more private; suitable for using in some private occasions; such as security guards; police; eavesdropping; secret agents; also great for hunting of tactical headset; churches staff in leisure; paintball; nightclubs; bars; paintball; security;restaurants; hotels; airports; casinos; manufacturing plants; conventions; concerts; warehouses; supermarket; retail; TV work studios; entertainment industries; and noisy environments Comfortable earbud; radio earpiece with comfortable earbud can fit to the ear and enjoy long time using; will not hurt your ear 360°stainless fixed clip; that you can fix the PTT to the convenient place; PTT to pin: 3.20feet; PTT to catheter interface: 1.87feet; covert acoustic tube: 1.15 feet; total length: 6.22 feet K head 2 pin; compatible with Retevis RT22 RT21 RT68 RT68H H777 H777H RT27 RT86 RT86A RT86S RT-5R RB26 RB26H C4 walkie talkies. Compatible with Pxton, Baofeng BF-888S/BF-T26/BF-F8HP, Kenwood radio Notice:If the sound quality for receiving starts to get fuzzy,please disconnect the clear tube ear piece and blow it out with an air in a can, because the air in the tube will effect the transmission. If you clear the tube earpiece and the white tube is intact but the issue still not solve, please contact with us.And Before purchasing, please confirm whether your walkie-talkie model is included in the following models. Compatible with Retevis:RT22/RT21/H777/H777H/RT68/RT68H/RT19/RT27/RT22S/H777S/RT15/RT18/RT27V/RT21V/RB38V/RB17V/RT5R/RT85/RB17A/RT10/RT1/RT86/RB25/RT81/RT56/RB37/RB35/RT17/RB17/RB17P/RB28/RT3S/RB29/RT76P/RA85/RB85/RB87/RT86S/RT86A/NR10/C5B/C65B; Compatible with Pxton 888S/999S/666S/777S/S1; Compatible with Samcom:FPCN30A/FPCN10A/FWCN30A; Compatible with Baofeng BF-T26/UV-5R Series/BF-F8HP/UV-82 Series/UV-82C/UV-82H/BF480/490/320/V6/520/530/999/888/777/666S/777S/BF-888S and more; Compatible with Kenwood: TH-F6/F6A/D7/D7A/D7AG/D7E/F7/F7E/G71/G71A/TH-G71E/K2/K2A/K2E/K2ET/21/21AT/21BT/22/TH22A/22AT/22E/25/26/27/28/31AT/31BT/41AT/41BT/TH42/42A/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/TK3118/3130/3131/3160 etc; Compatible with Arcshell：AR-5/AR-6; Compatible with Linton: LT-2288/3288/6288/5288/3188/2188/3260/2268/3268,/6288/6188/3288A; Compatible with HYT：TC286 386 2685 3865 6685/TC 278 378 388/TC 2100 2088; Compatible with eSynic:‎ 240. Package Includes:2 x Retevis Covert Acoustic Tube Walkie Talkie Earpiece