Features:  Electric Muscle Stimulator: The muscle trainer adopts low frequency Electrical Muscle Stimulation technology, which helps build muscle, lose fat, release muscle, reduce muscle pain, and get a massage effect.  10 Modes & 20 Intensity: Multiple modes to meet your multiple needs, and you can adjust intensity directly by press the button +/- on the controller; LCD screen design make it easier for you to use.  Train Your Muscle Every Day: 20 minutes is a course of treatment, when time is due, it is automatically shut off. If you want a longer period, you need to reset for another session. It is better to use it 30min after a meal or a bath, and 1-2 time every day.  USB Charging: Built-in 150mAh rechargeable battery that can be charged by USB charging cable conveniently. You can connect the USB cable to the laptop/desktop/power bank and phone charger USB port for charging.  Wide Applications: The muscle trainer belt can shape your muscle effectively, release pressure and easily lift muscle without sport. Suitable for muscle training while reading, watching a movie, doing housework, etc.    Specifications:  Mode: 10  Intensity: 20  Battery Capacity: 150mAh  Charging: USB cable    Packing List:  1 * Arm Belt  1 * Controller  1 * USB Charging Cable  1 * Instruction Manual