Ultrasonic Technology: Using biological sound waves (ultrasound + bionic waves), the superimposed double-wave rings can imitate the sound of female mosquitoes (male mosquitoes and cockroaches), so as to achieve the effect of repelling mosquitoes . Long-lasting mosquito repellent: Smart rechargeable mosquito repellent bracelet, built-in smart chip, USB quick charge, 30 minutes charge, 30 days standby time, 130 hours use, effectively repel mosquitoes, insects and mosquitoes from you and your children. Stylish and lightweight: adjustable, stylish and portable black silicone strap Say goodbye to plant-based leather and avoid harmful chemicals. Odorless, suitable for babies, children and adults. No mosquito spray is required. Safety: Our electronic mosquito repellent bracelet, ultrasonic to create a sound barrier, pure physical mosquito repellent, chemical-free, safer, more environmentally friendly, safer, healthier, can be worn by the elderly, children, pregnant women and pets. . Enjoy your time outdoors and indoors in comfort: Our mosquito repellent bracelets are small and comfortable to wear. This can be a problem if you often go on vacation or do outdoor activities. It's perfect for vacations, outdoor dining, hiking, camping, jogging, or fishing.