Feature: 1. Effectively reduces muscle tension through high frequency vibration. 2. Suitable for hand weakness or no feeling, vibration can stimulate the sensory nerve, conducive to the rehabilitation of the hand. 3. Rechargeable portable, can be used anytime and anywhere without being tethered by wires. 4. 1200mAh battery capacity, available for use about 120 minutes, full charge for about 120 minutes. 5. Applicable people: suitable for people with grasping ability; Suitable for people who have certain grip strength but not strong grip; Suitable for people with drooping wrist without grip. Specification: Item Type: Finger Rehabilitation Tool Material: ABS + Cloth Plug: US Optional Type: Finger Type Massage Ball, Wrist Type Massage Ball Battery Capacity: 1200mAh, available for use about 120 minutes, full charge for about 120 minutes Ball Diameter: Approx. 9.5cm / 3.7in Ball Weight: 295 g / 10.4 oz(approx.) Input Voltage: 110-240V Output Voltage: 7.4V Time Setting: 10 minutes Battery Life: About 120 minutes Charger Line Length: Approx. 80cm / 31.5in Gear: 4 Gears adjustable Recommended Use: 10 minutes for each time, three times a day Package List: 1 x Massage Ball 1 x Finger Sleeve 1 x Charger