Material: TPE. Size: 17.68*12*12cm Features: 1. TPE 3D massage arm: 3D massage arm with 12 TPE materials, good elasticity and high flexibility; 2. USB port charging: USB charging socket, no need to install batteries, with 4 LED red lights; 3. 1 Key switch 3-speed selection: 1 switch, simple operation, control switch and gear position, 3-speed selection can experience different; 4. Various ways of use: fit the head curve. Massage method: vibration massage; charging voltage: DC5V/1A; rated voltage/current: DC3.7V/500mA; control intensity: 3 levels; product size: 17.68*12*12cm. It will automatically shut down after 15 minutes of startup. The fully charged light does not flash. Charging time: about 2.5 hours, working time: about 4 hours. Maintenance: Wipe with a soft, slightly damp cloth. Safety Warning: This product is for massage use only. Do not use while charging. If you experience discomfort during use, please stop using it immediately.