Mosquito repellent principle: The bracelet achieves the effect of repelling mosquitoes by imitating the sounds of female mosquitoes, such as the sounds of male mosquitoes and dragonflies In nature, blood-sucking female mosquitoes are in the stage of conception and laying eggs. At this price, female mosquitoes can prevent male mosquitoes and avoid secondary pregnancy, so the sound of male mosquitoes can achieve mosquito repellent effect. Product features: pure physical mosquito repellent, non-chemical mosquito repellent, safer, safer, more environmentally friendly, healthier, can be worn by the elderly, children, pregnant women, pets The product can be worn indoors and outdoors (sea, park, camping, hiking, fishing) Product Name: Ultrasonic Mosquito Watch Function: Sonic Mosquito Repellent Input: 5V/0.5A Output: 34Hz-70KHz Battery capacity: 80mAh Charging time: about 30 minutes Battery life: 150 hours Package includes: 1 * Mosquito Repellent Bracelet 1 * Charging Cable