Covert Acoustic Tube Earpiece Headset Mic for Motorola Tetra MTH800 MTH850 MTP850 MTH650 MTH600 etc. 1.Excellent for use in FBI, Bodyguard, police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments. 2.Compatible Models: Motorola MTH600, MTH650, MTH800, MTH850, MTP850, MTS850