Motorola PMLN7156A Earbud W/INLINE MIC AND PTT 

This Motorola Solutions Mag One earbud is small, comfortable and enables users to discreetly send and receive messages. 
Features an in-line microphone and push-to-talk. The Motorola Solutions PMLN7156 is comfortable for multiple ear sizes,
can be worn on either ear and can be wiped down with an alcohol pad between users.

Compatible with MOTOTRBO SL300, SL3500e, SL 7500e, TLK 100, TLK 110