Function: Ultrasonic mosquito repellent Input: 5V/1A Output: 34Hz-70KHz Battery capacity: 90mAh Charging time: about 30 minutes Battery life: 130 hours Product color: black.white Packing size: 45*60*100mm 1Safe and environmentally friendly: Pure physical ultrasonic mosquito repellent, no chemical additives, no radiation, no peculiar smell, the elderly, pregnant women, children, pets are completely safe and environmentally friendly. It is harmless to health and can be used with confidence. 2A must-have mosquito repellent bracelet: USB fast charging, fully charged, can work continuously for up to 7 days, standby for 180 days, effectively avoid more than 90% of mosquitoes, and it is convenient to know the time in the wild. 3Adjustable length: The mosquito repellent bracelet is fully adjustable and fits easily in every hole, suitable for both adults and children. 4No more mess: Greasy repellent creams and sprays, this sonic wristband is free of harmful chemicals to keep mosquitoes away and is safe to use in everyday life.Due to the lighting effects and shooting angles, there is color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size.Ultrasonic mosquito repellent bracelet*1