Specifications: Designed for Motorola Mobile radios back to back to make a talkthrough repeater work as duplex model, both radio will receive and transmit. Length: about 38cm Compatible models: For Motorola CM300, CM200 CM series, (must use 2 CM series models.) For Motorola CDM750, CDM1250, CDM1550, (CDM series plug into the center 16 pin of the 20 pin jack) For PM400 For GM SERIES For GM300 Series For M Series For Maxtrac Series For Radius Series For M1225 For GM380, GM950, GM340, GM360, GM3188 SM50, SM120 also work with other radio that has 16 or 20 pin accessory jack at the back. Package include: 1 x Duplex Repeater Interface Cable Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.