Benefits and Features: Relieves pain in shoulders, hips, back and limbs; Prevents pain impulses from being carried to the brain ("pain gate" effect); Improves blood circulation; Promotes metabolism; Relieves muscular pain; Pushing,tapping,Kneading and rhythmical vibration make the massage more effective and more enjoyable Work-out anytime and anywhere Helps Reduce and Control Pain to help you feel better Exercises inactive muscles; Eases neuralgia; Relieves muscle spasm; Relieves muscle and joint stiffness; 4 therapeutic treatment mode selections (3 different and 1 that alternates automatically between them); Intensity adjustments from level 1 to level 10; LED Indicators; Dual Channel; 4 durable, washable, Gold Hand electrode pads; Compact and lightweight design allows it to travel anywhere; Auto shut-off; Powered by 2 x AAA batteries (NOT included) 100V/20mA Frequency: 2 - 100 Hz; unit dimensions: 60 x 100 x 15 mm Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store