Mosquito Repellent Bracelet: Pure physical repellent, no chemical additives, no radiation, non-toxic, safer and more environmentally friendly. Does not affect your health. Waterproof device. Ultrasound principle: The bracelet can effectively drive away 70% of mosquitoes by imitating insect sounds. Suitable for outings, travel, business trips, etc., to avoid mosquito harassment. Energy saving: Built-in smart chip, intelligent low-power operation all the time day, saving energy. Fast USB charging. It is charged every 30 minutes and can be used for up to 130 hours. Effectively drives out 70%-80% of mosquitoes. The third gear activates the bracelet: the bracelet lights up: daily indoor use. Press the second button again: switch to the second gear outdoor sport mode. Press the button 3 times again: silent mode. Wide Use: Stylish mosquito repellent bracelet with high quality design. Effectively repelling mosquitoes, children and adults can use it. Whether you are indoors, camping, fishing, hiking, sports, barbecue, providing you with a comfortable summer. Features: Name of the item: Mosquito repellent bracelet. Material: Silicone. Power supply: Built-in battery (included). Function: Ultrasonic mosquito repellent. Charging time: about 30 minutes. Working time: 130 hours. Colour: black, white. Dimensions: 25.5 x 2.7cm. Package content: 2 mosquito repellent bracelets 2 USB charging cables