Portable Smart Sleep Instrument Handheld High Tech Charging And Soothing Instrument Features: Improve sleep. If you can sleep peacefully, who wants to have insomnia until daytime? This product can solve the culprit of modern people's sub-health problems. Principle of use: This product uses microcurrent to stimulate the brain and adjustment brain emotions to improve sleep. Easy to carry with you, say goodbye to bulky and cumbersome equipment. It is light in weight and can be carried with you wherever you like. There are two modesThe first is the relaxation mode. After use, the nerves are stimulatedand the temperature of the hands will rise. The last is the invigorating mode. After use, the nerves are stimulated and the temperature of the hands will drop. Quality AssuranceCommitted to providing every customer with quality products and the highest standard of service. Product Description: Weight50g Size8*9*3.2cm Power0.5W Battery capacity400mAh Input voltageDC5V0.5A Charging time60-70min Contain1sleep device1Type-c1manual