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The HM-127 has a slim dimension that fits right into the palm of your hand. Built with a sizable LCD that allows you to control all functions of the main unit (except DSC operation). You can talk with the main unit as an intercom or use it any way you would use your main unit. 6 meters of extension cable is attached to the unit. Waterproof and light weight! Dimensions; 2 11/32''W x 4 25/32''H x 1 3/16''D.