Designed for mobile radios back to back to make a talk repeaterIt works as a dual model, the radio will receive and transmit and high qualityCompatible models: CM300, CM200 CM series, (series models must use 2 CM). CDM750, CDM1250, CDM1550, (CDM series plug in the middle 16-pin of the 20-pin connector). PM400. series. GM300 series. The . Maxtrac series. Serial radio. M1225. GM380, GM950, GM340, GM360, GM3188. SM50, SM120Also works with other radio that has 16 or 20 pin accessory jack on the backLength: 38cm (approx.)colour: grayMaterial: ABSsize: 10x6x3cmPackage Contents:1 x Dual repeater cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.