General description This 2pcs Ultrasonic Mosquito Repellent Watch set includes a white and a black bracelet designed for both kids and adults. Made from skin-friendly silicone, these bracelets are safe, non-toxic, and environmentally friendly, making them suitable for all ages. They effectively keep annoying mosquitoes away, protecting your skin from bites without the use of harmful chemicals. Technical specifications Material: Skin-friendly silicone Charging: USB rechargeable Charging time: 30 minutes Standby time: 30 days Usage time after full charge: 130 hours Usage The adjustable strap fits most people. The bracelet uses biological sound waves (ultrasonic bionic waves) to repel mosquitoes. Imitates unpleasant sounds of female mosquitoes, male mosquitoes, and cockroaches to deter bloodsuckers. Other information Note: Reset the time when the battery is completely discharged. It is recommended to charge the bracelet before it is completely discharged.