Choose a setting on the power units dial to control the intensity and go from a sensuous tingle to a throbbing tap in seconds. Switch between SLOW or FAST to control the frequency of the shock, or adjust the dial to control the strength of the shock. Battery type: AAAX2 (1.5V) Do not include battery. Voltage: DC 3V Pulse output power : MAX 100 V/20mA Pulse frequency: 2-100Hz, Pulse Mode: 10 files strenth, 5 kinds of rhythm