Courier Traveller II Make Courier Model Traveller II Sams # CB-31 Courier Traveller II Technical Specifications AttributeDetails ManufacturerCOURIER ModelTRAVELLER II Product CategoryTransceiver Mic Wiring Pin 1 – TX / PTT Pin 2 – RX Pin 3 – Mic Audio Pin 4 – Shield / Ground Pin 4 – Switch Line