1. Variable Frequency Mosquito Repellent: The bracelet emits variable frequency sound waves to form a protective barrier. With three frequencies, it is suitable for various environments, making mosquitoes feel uncomfortable and stay away, thus achieving the mosquito repellent effect. 2. Time - and Effort - Saving: The ultrasonic bracelet is an intelligent device with a built - in chip. It can be quickly charged via USB. Only 30 minutes of charging time is needed, and it can work for a week, meeting the long - term mosquito repellent needs. 3. User - friendly Design: The mosquito repellent bracelet can also function as an electronic watch to display time. It has a soft and skin - friendly silicone strap, and the length can be adjusted according to the size of the wrist, ensuring a comfortable wearing experience. 4. Safe and Reliable: It is a pure physical mosquito repellent bracelet, non - toxic, harmless, healthy and environmentally friendly. It is very suitable for children, adults and the elderly to use anywhere. 5. Usable Anywhere: The mosquito repellent bracelet can effectively drive away mosquitoes and protect you from mosquito bites all day long, whether you are indoors or outdoors, at home, in the office, camping, hiking, fishing, etc.