Pulse Massager Functions and effect: 1. It is obviously effective to alleviating the symptoms of cervical spondylosis, periarthritis, arthritis, and lumbar muscle strain; 2. It can ease peripheral nerve palsy; 3. It can ease myalgia; 4. It can promote blood circulation; 5. It can remove fatigue Characteristics: 1. There are 4 proper therapeutic modes: Press, rub, vibrate and thump; 2. Different automatic massager process is set according to the specific characteristics of your shoulder, waist, joint, hand&foot, and leg, which makes effective therapy Power Source: DC4.5V (Use 3*AA alkaline dry batteries or external power source. ) Frequency: 2~1000Hz Current Consumption: About 40mA (operating impedance: 500Ω ) Battery Lifetime: About 3 months if used for 3 months, 15 minutes/day (operating impedance: 500Ω ) External Size: 150mm (length)× 100mm( width)× 46mm (height) Weight: A bout 200g (not including dry batteries) Normal Operation: At 5~55° C Environment: Humidity < 80%RH Storage and Transportation temperature: Temperature -20~55° C Environment: Humidity < 10~95%RH Safety Classification: Class II-BFIt is obviously effective to alleviating the symptoms of cervical spondylosis, scapulohumeral periarthritis, arthritis, and lumbar muscle strain. It can ease peripheral nerve palsy. It can ease myalgia. It can promote blood circulation. It can remove fatigue.