eatures: 1. Provide CES(Cranial Electrotherapy Stimulation) treatment to apply pulsed low-intensity current to the Laogong acupoint in the palm of the hand which will increase the secretion of endorphin in the brain and block the transmission of pain nerves to easily relieve your headache tension anxiety depression fatigue and effectively help reduce sleep disturbances like insomnia and improve overall sleep quality. 2. Mini and handheld device can directly enable safe and painless physical treatment when you hold it staying away from drugs no side effects caused and less patient burden. 3. Adjustable modes and power intensity levels can be switched with user friendly operation you can choose freely according to your demands. 4. Built-in rechargeable 500mAh battery can be directly powered only about 1.5 hours needed for USB charging with high efficiency lightweight and portable design allows you to carry it anywhere and anytime for home and travel use. Specifications: Material: ABS+Stainless Steel Color:white/yellow/green(Optional) Battery Capacity: 500mAh Input Voltage: DC 5V/1A Working Power: 0.5W Working Current: 1.5-2A Charging Time: about 1.5H Charging Interface: Micro USB Product Size: Approx. 3.85*4.05*6.85cm Package Included: 1* Sleep Aids CES Insomnia Device 1* USB Cable 1* User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store