This is a battery powered test fixture which converts the voltage or impedance seen at its inputs to an audible tone, about 200Hz to 1.6kHz. Power comes from three AAA batteries, and the unit turns itself off an on automatically. Power consumption in standby is TBDµA, and when making a 200Hz tone the current is TBDmA. With 20 minutes of use per day, 5 days per week, 50 weeks per year, the batteries should last TBD years, but of course the batteries' self-discharge will likely force their replacement within a few years.