Anti-mosquito bites: Our ultrasonic bracelet can effectively prevent you from being bitten by mosquitoes. It can be worn indoors and outdoors, which is more convenient. Safe to use: You can use this mosquito repellent bracelet with confidence. It is made of safe materials, more environmentally friendly and safer, and can be worn by the elderly, children and pregnant women. Energy saving: this mosquito repellent bracelet is very energy efficient. It can be used for a long time after charging for 30 minutes. It can be charged via USB, which is very convenient and practical. Easy to carry: This ultrasonic bracelet is easy to carry, whether you are indoors or camping, fishing, to hiking, sports, etc., you can use it easily. It can also display the time. Perfect Gift: This mosquito repellent bracelet is the perfect birthday gift for your family and friends to have a perfect summer. They will be very happy to receive this practical gift.