Power supply 800mA, These instruments will operate with any voltage from 12 to 35 volts D.C. and can be powered for your D.C. bus. If no D.C. power is available these wall mount supplies will operate with any input from 100 to 240 VAC(90 to 264 VAC) 47 to 63 Hz. 4 A.C. plugs are included for outlets in USA, UK, Europe and Australia. Powers up to 4 Instruments.