Feature:1. Physical Principle: Microcurrent handheld sleep aid stimulates cerebral cortex neurotransmitters through microcurrents, regulating mood and promoting sleep2. Soothing Effects: Microcurrent handheld sleep aid has a calming natural sound that soothes irritable babies and allows them to sleep peacefully.3. Pressure Release: Microcurrent handheld sleep aid gives you baby like sleep quality, placing the product in the palm of your hand to relax key nerve tendons.4. Three Working Modes: Microcurrent handheld sleep device has relaxation mode, soothing mode and sleep mode, all working for 15 minutes, after which automatic shutdown protection.5. Power Supply: Handheld sleep device can be connected to computer USB port, mobile power, power adapter and other charging methods, long lasting battery life, full charge can be used about 80 times.6. Widely Used: Microcurrent handheld sleep device is easy to carry, suitable for home, travel, mother and baby play, school buildings, etc., away from mosquito bites, sleep peacefully.7. Simple Operation: Microcurrent handheld sleep device long press on and off, short press to switch mode, doubleclick to turn on and off mosquito repellent mode, knob to adjust the current level.Specification:Item Type: Microcurrent Handheld Sleep DeviceMaterial: PlasticSize: Approx. 3.8x3.8x6.6cm / 1.5x1.5x2.6inBattery Type: Lithium Battery 5V 500mAh (with Built in Battery Delivery)Battery Life: 12 HoursCharging Time: 1-2 Hours to Fully Charge.Package List:1 xMicrocurrent Handheld Sleep Device1 x Manual 1 x USB Cable 1 x Lanyard Note:1. It is not powered by battery. You need to connect the power supply when using it. 2. Please allow some error in manual measurement.