Features15 levels of vibration speed, strong power, giving you different levels of massage experience. 2Simple panel layout, convenient for operation. USB charging port, easy to charge and use. 3Imported vibration motor, strong vibration and more stable. High?density lithium battery pack, stable and durable, in the vibrating roller high?frequency mode, it can provide more than 2 hours of working time after each charge. 45000back/minute, using high?strength precisice vibration core, with five?gear frequency adjustment, improve fatigue. 5Eco?friendly PU material flexible massage layer, does not contain harmful substances such as chemical additives.SpecificationCondition: 100% Brand NewItem Type: Yoga RollerMaterial: PUProduct Size: Approx. 31.5 x 8.5cm / 12.4 x 3.3inTwo Modes: The uniform speed mode is a continuous and steady stimulating muscle mode, which is more soothing and gentle.The variable speed mode belongs to intermittently strongly stimulating the muscles, giving the muscles involuntary stimulation, which is equivalent to point-pressure stimulating the muscles, changing the habit of the muscles.Power Supply Mode: Lithium BatteryBattery Capacity: 2000mAh (Included)Vibration Frequency:3000back/minute3400back/minute3800back/minute4200back/minute5000back/minuteHow to Use: Long press the power button to turn on, short press to change the strength, a total of 5 strength, long press to shut down.Package List1 x Yoga Roller 1 x USB Charging Cable 1 x English Manual 1 x Storage Bag