Motorola AAL83X501 1-Wire Surveillance Kit
Monitor communications hands-free with a simple earpiece and microphone. The MH-101A4B is a 1-wire surveillance style earpiece with microphone. It includes a clear tube earpiece with mushroom tip and an inline microphone with Push-to-Talk (PTT).
Use with VX-261, VX-264, VX-451, VX-454, VX-459, EVX-261, EVX-531, EVX-534, and EVX-539 radios. Not for IS version radios.