Single ch. beltpack in ABS case with metal beltclip & volume controlled AUX program input - Single channel portable intercom station with AUX program input option, housed in a strong ABS case with a sprung metal belt clip. It is powered via the intercom party line from a PRO Series master station or separate power supply unit. All electronic circuitry is based on surface mount technology, offering maximum durability and ease of technical service. FEATURES TALK and CALL Buttons Headset Volume Control Mic Mute Each beltpack is provided with a mic mute circuit, allowing a push button on PRO Series master stations or power supplies to mute the headset microphone. Program Input Binaural Headset Connector optional.