Electronic Pulse Massager Features: There are 4 proper therapeutic modes: press, rub, vibrate and thumpDifferent automatic massager process is set according to the specific characteristics of your shoulder, waist, joint, hand&foot and leg, which makes effective therapy 8 levels of massage intensity for each mode for your different needBattery and AC adapter workable and switch freely, you can enjoy yourself anytime, anywhereOne Big LCD display all details of treating styles The power is automatically cut off after 15 minutes treatment Functions and effects: It is obviously effective to alleviating the symptoms of cervical spondylosis, periarthritis, arthritis, and lumbar muscle strainIt can ease peripheral nerve palsyIt can eases myalgiaIt can promote blood circulationIt can remove fatigue Specification: Power Source: DC4.5ν (Use 3*AA alkaline dry batteries or external power source); Size: 150mm(length)*100mm(width)*46mm (height); Weight: about 200g (not including dry batteries) Frequency: 2-1000Hz,Current Consumption: about 40mA(operating impedance:500Ω)Battery Lifetime: about 3 months with 15-minute usage per dayNormal Operation: at 5-55 degrees CelsiusEnvironment: humidity<80% RH;Storage and Transportation temperature: temperature -20-55oC; Environment: humidity<10-95% RH; Safety Classification: Class II-BFAutomatic power off: 15 minutes