Important Note:package includues-1 x covert tube walkie talkie earpiece only compatible with Motorola; M head plug 2 pin; only compatible with Motorola CP100 CP100D CP185 CP200 CP200D GP300 GP2000 EP450 Mag ONE BRP40 A8 RMU2040 RMU2080D RDM 2070D RDU2080D RDU4100 walkie talkies; can't compatible with Retevis or any other brands of walkie talkies Covert air tube surveillance earpiece; walkie talkie earpiece with mic makes communication more private; less susceptible to electromagnetic waves Full size PTT button; walkie talkie earpiece with full size PTT button design; guarantee precise operation even with gloves Double-wire design; pin end of two way radio earpiece is connected to two way radios and hung around waist; and PTT/MIC end can be passed through sleeve from the inside of clothes for easy talking Soft and comfortable earplug; ergonomic earplug of ear piece for walkie-talkies soft and comfortable; can be worn on both ears; suitable for long wear Notice: if the sound quality for receiving starts to get fuzzy,please disconnect the clear tube earpiece and blow it out with an air in a can,because the air in the tube will effect the transmission.In addition, please rotate the white tube until it stuck in the connection. Compatibility: compatible with Motorola portable two way radios: GP Series: GP Series: GP2000 , GP2100, GP300, GP308, GP68 , GP88, GP88S,EP450 PR400,GP88S; CP Series: CP88, CP040, CP100 , CP110, CP125, CP150, CP200, CP250, CP300 ,CP1300 CP1220 CP1660 CP1600; SP Series: SP10, SP21, SP50+, SP50; CT Series: CT150, CT250, CT450, CT450LS; PRO Series: PRO1150, PRO2150, PRO3150; P Series: P040, P080, P110, P1225, P1225LS; EP Series：EP450, EP350; MAG ONE Series: A6 A8 A10 A12; compatible with HYT portable two way radios: TC500 TC600 TC700 TC610 TC2100; What's in box: 1 X 2 Pin Covert Acoustic Tube Earpiece