The left side of the front panel has the 1/4" jack socket for the microphone input along with the mode selector/mains on/off switch. The transmitter has VOX Tx switching if required with the VOX gain and delay adjustable fron the font panel switch. Additional adjustments are available via preset controls accessible under the top panel hatch.This includes the P.A. bias current. A simple slide switch selects the meter function: RF power output,the P.A. total current or the ALC voltage.