1-Wire, Receive Only Earpiece, 3.5mm threaded jack to screw into any radio or lapel/ speaker microphone. Includes clear acoustic tube and mushroom ear tip. 

Compatible Motorola APX Remote Speaker Microphones include but are not limited to NMN6274, PMMN4084, NMN6274, NMN6274B.

Compatible Motorola XTS Remote Speaker Microphones include but are not limited to PMMN4051B, PMMN4045B1.

Note: This receive-only earpiece is 100% compatible with any remote speaker microphone that has a 3.5mm threaded accessory jac/port.