This unit allows you to remotely locate the transmit/receive base unit and only have the microphone itself within easy reach. All functions for the unit are on the face of the microphone, there are no controls on the power unit at all. The microphone has a speaker in it, which enables you to completely control the transceiver from this unit. 100 User Programmable RX Channels Group Scan 3 LCD and 1 Key Backlight Colour Signal Strength and Power Meter Call Tone Melody Key and Ringer Tone Selection CTCSS(38) & DCS(104) Status Codes Channel / Memory Scan Stop Watch Function Volume Adjustment Power Output: 5W Voltage: 12-24VDC For More info on CB Radios. Specifications Communications Band : CB Radio Channels : 80.0 CTCSS transceiver : true Transceiver Scanner : true Call Tone : true Line of Sight Range : 18.0km Key Lock Function : true Backlit LCD : true CB Output Power : 5.0W Length : 100.0mm Width : 127.0mm Height : 25.0mm Additional Part Details : Microphone Width : 57.0mm Height : 102.0mm Depth : 27.0mm