Base: built in two 3.6V/2000mAh Li-ion battery packs, and chargevoltage is 5VD.C, 1A. Motor handpiece: built in a 3.7V/600mAh Li-ion battery pack. Foot Pedal: built in a 3.6V/750mAh Li-ion battery pack. Power adapter (Model:ADS-6AM-06N 05050EPG): Input: ~100V-240V 50/60Hz 0.4A Max Output: DC5V/1A Torque range: 0.4Ncm~5.0Ncm (4mNm~50mNm) Speed range: 100rpm~2500rpm