The unit comes in the very rugged Rocket housing and features Hard Wire Bypass and an attractive and striking Signal Red paint finish. It has two controls: Output Level, Drive or Gain and is powered by an internal 9 Volt battery with an operational life of over 150Hrs so changing a battery should not be a problem. An external power supply (not supplied) can be used. Successful operation is simple and is probably our easiest box to use with no previous knowledge or study of a manual required.