[ ULTRASONIC MOSQUITO REPELLENT ] This mosquito repellent is a high-tech wristband that uses ultrasonic sound waves to keep bugs away. But the high-frequency sound waves are inaudible to human ears, ensuring your safety and protection from annoying mosquitoes.[ RECHARGEABLE ] This extra-strength mosquito repellent band is rechargeable. It has a fast USB 30min charging time that can work up to 150 hrs. With 10M expandable coverage and indoor/outdoor function modes, it is super convenient to use.[ NON-TOXIC ] The best thing about this bracelet is that it uses skin-friendly silicone, the material also has a non-toxic and harmless formula so you can wear them without worrying about any negative effects on your health. It does not have any smell - provides extra protection from being bitten by bugs.[ MULTI-PURPOSE WRIST BAND ] This stylish anti-mosquito bracelet is perfect to protect you and your loved ones from annoying bugs/insects. It can be used indoors or outdoors, whether camping, fishing, hiking, or during sports.[ SIZE ] The adjustable rubber strap measures 235mm long and 11mm thick. This adjustable strap can fit both adults and kids.