Acupuncture Treatment Instrument( TENS), applying for relive pain through low frequency pulse to stimulate the points. Unique varying pules width and rate Effective for pain relief Mini size Battery: DC3V(CR2032Li battery) Output pressure: Max: 80vp-p By 500 Q Load + - 20% Output wave band adjustment: 0-10 (10 bands) Battery life: 15 hours (average) 10 minutes/time by 90 times Weight: About 13 g excluding battery 16 g including battery