Product name: Ultrasonic Mosquito Repellent Watch Product model: M60 Function: sonic mosquito repellent Input: 5V/0.5A Output: 34Hz-70KHz Battery capacity: 80mAh Charging time: about 30 minutes Endurance working time: 150 hours Product color: black .white Principle of mosquito repellent: The bracelet achieves the effect of repelling mosquitoes by imitating the sounds that female mosquitoes hate, such as the sounds of male mosquitoes and dragonflies. In nature, the blood-sucking mosquitoes are all female mosquitoes, and they are in the stage of conception and egg-laying. At this stage, female mosquitoes will avoid male mosquitoes and avoid second conception, so simulating the sound of male mosquitoes can achieve the mosquito repellent effect. Product features: pure physical mosquito repellent, not chemical mosquito repellent, safer, more assured, more environmentally friendly and healthier. It can be worn by the elderly, children, pregnant women and pets. The product is portable indoor and outdoor wear (the seaside, park, camping, mountaineering, fishing can be worn).