It has the similar function of a T.E.N.S. unit which stimulates nerves electrically by transmitting current through the skin to relieve some types of pain such as chronic, acute and post-operative pain. An ideal tool for home usage. Operated by 9V dry battery. This offers sensitive acu-point or trigger point location and stimulation, which are independently adjusted with two separate control dials. The pulse frequency is fixed at 10 Hz. A flashing light and sound indicate when point detection is made. The spring activated detection probe allows a uniform pressure when searching. The grounding circuit is made by holding the metal of the unit or with the hand grounding pole. • Frequency: 10Hz (fixed) • Volts & current: 0-25 bolts, 0 to 50 milliamps • Pulse width: 220 microseconds • Pulse shape: asymmetric biphasic square wave • Pulse mode: continuous