Non-toxic and safe - This rechargeable mosquito repellent bracelet uses skin-friendly silicone, non-toxic and harmless, contains no harmful substances, produces no odor or harmful substances, suitable for infants and adults > > Ultrasonic technology using biological sound waves (ultrasound + bionic waves), overlapping double ring sound playback, you can imitate the sound of female mosquitoes (male mosquitoes and cockroaches), thus achieving mosquito repellency < /p> USB charging smart charging mosquito repellent bracelet, built-in smart chip, USB fast charging, 30 minutes of charging, 30 days of standby time, 130 hours of use, saving time and trouble , effectively avoid more than 90% of mosquitoes Multi-mode selection - Press once to turn on the switch to start indoor mode; press again to switch outdoor sports mode; press again a third time to activate silent sleep mode; press a fourth time to turn off the device Use it widely - this mosquito repellent bracelet is stylish and lightweight, whether you are indoors or camping, fishing, hiking, sports, barbecue are very suitable, can protect you and your loved ones from mosquitoes, enjoy a perfect summer