Non-toxic safety and environmental protection: This rechargeable mosquito repellent bracelet uses skin-friendly silicone, which is non-toxic, odorless and has no added chemicals, suitable for babies and adults. This mosquito repellent bracelet can keep those nasty mosquitoes away and protect your skin from biting, without harmful chemicals, safe and healthy. The adjustable watchband is suitable for most people. Biosonic Mosquito Repellent: This mosquito repellent bracelet uses biological sound waves (ultrasonic bionic waves). Most leeches are female mosquitoes. The bracelet imitates the unpleasant sounds of female mosquitoes, such as the sounds of male mosquitoes and cockroaches. The updated version is equipped with a time display function. Multiple application scenarios: A variety of mosquito repellent modes meet your different needs. Press the power button once to turn on the switch and enter internal mode. Double tap to switch outdoor sports mode; press three times to enter the quietest mode, suitable for sleep; press four times to turn off the device. Click the time display button to display the time. Effective mosquito protection: It is very suitable for indoor and outdoor activities. Provides protection against mosquito bites for up to 130 hours. Very suitable for outdoor activities such as outdoor camping, running, traveling, fishing, barbecue, gardening, picnic, golf and even a simple outdoor barbecue. Note: Daily life waterproofing is possible, but diving into water is prohibited.