Product name Ultrasonic mosquito repellent watchProduct model M30Function acoustic wave to repel mosquitoesInput 5V/0.5AOutput 34Hz-70KHzBattery capacity 80mAhCharging time is about 30 minutes150 hours of service lifeProduct color: black, white, blue and pinkMosquito repelling principle The bracelet achieves mosquito repelling effect by imitating the unwanted sounds of female mosquitoes, such as the sounds of male mosquitoes and dragonflies. In nature, all the blood sucking mosquitoes are female mosquitoes, and they are in the stage of pregnancy and spawning. At this price, female mosquitoes will avoid male mosquitoes and avoid secondary pregnancy. The simulated sound of male mosquitoes can achieve mosquito repelling effectProduct features: pure physical mosquito repellent, not chemical mosquito repellent, safer, more secure, more environmentally friendly and healthier. The product can be worn by the elderly, children, pregnant women and pets. The product can be worn indoors and outdoors (seaside, park, camping, mountaineering, fishing).