Brand new and high quality. Ultrasonic mosquito repellent. Pure physical mosquito repellent, not chemical mosquito repellent, safer, more environmentally friendly, more assured and healthier. The bracelet achieves the mosquito repellent effect by imitating the sounds that female mosquitoes hate, such as the sounds of male mosquitoes and dragonflies. It can be worn by the elderly, children, pregnant women and pets. Perfect for running, cycling, hiking, barbecue, etc. Specification: Type: Mosquito Repellent Sticker/Mosquito Repellent Bracelet. Color: Black/White Input: 5V/1A Output: 34Hz- 70KHz Charging time: About 30 minutes Endurance working time: 130 hours Package dimensions: 45*60*100mm Total weight: 50g Package included: 1 ultrasonic mosquito repellent bracelet.