Stimulate brain nerves through micro currents, regulate emotions and promote sleep.Pure physical adjustment, does not hurt the body.It weighs only 55g and is easy to carry.USB fast charging, long battery life.Frosted texture, comfortable grip.Instructions:Rotate the OFF button at the bottom for low frequency mode, which is helpful for sleep. Recommended for left-handed use.The M key is a high-frequency excitement mode, which can stimulate the brain's nerves, lift the spirit, and maintain the state of excitement. Recommended for right-handed use.Product name: Intelligent sleep aidMaterial: ABS+Stainless steelNet weight: 134gPower supply mode: USB chargingBattery capacity: 500mAhLife time: 20hWord work time: 20minProduct size: 68.5*38.5*40.5mmMode: sleep mode / strong mode