Thank you for purchasing the ACVIOO Mushroom-massager with us. We aim to make every guests satisfied. This ACVIOO mini Mushroom-massager with 10 cycle frequencies .strong and powerful vibration. Long press the power switch can turn on/off it .and short press the Vibration mode switching button can change the vibration direction. This mini massager can relax your muscles, relieve soreness, can be used for the back, neck, arms, legs, etc , Wireless USB rechargeable, portable and convenient, can carry it to anywhere.