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 Before purchasing, please confirm whether your walkie-talkie model is included in the following models.(1)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;(2)Compatible with Pxton 888S/999S/666S/777S/S1(3)Compatible with Samcom:FPCN30A/FPCN10A/FWCN30A(4)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(5)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(6)Compatible with Arcshell:AR-5/AR-6(7)Compatible with Linton: LT-2288/3288/6288/5288/3188/2188/3260/2268/3268,/6288/6188/3288A(8)Compatible with HYT:TC 6685/TC 278 378 388/TC 2100 2088(9)Compatible with eSynic: 240; ect; Package Includes: 10 x Retevis Covert Acoustic Tube Walkie Talkie Earpiece