Earmor M51 Tactical PTT 3.5mm AUX BlackConceived and manufactured by Earmor, the M51 Tactical PTT 3. 5 AUX is an external PTT module designed for dedicated active and communication headsets. Made of high quality polymers and metal alloys, M51 Tactical PTT gives the option of simple and effective communication without the need for constant operation of the handheld radio. An additional buckle provides an easy way of attaching the PTT to any place on used gear. Compact size and rugged design