Specifications:The bracelet works by mimicking the unwanted sounds of mosquitoes to dispel the mosquito.Pure physical mosquito repeller, no chemical additives, no radiation, non-toxic, safer and more environmental friendly.Stylish mosquito wristband with high quality design and light weight is portable. Item Name: Mosquito Repeller BraceletMaterial: SiliconeBattery: Built-in Battery (Included)Voltage: 5VCharging Time: 30minutesUsing Time: about 150hoursFeatures: Portable, Non-toxic, Anti-Mosquito, UltrasonicSize: 29.6cm x 3.1cm/11.65" x 1.22" (Approx.) Notes:Due to the difference in the configuration of the light and the screen, the color of the item may be slightly different from the images.Please allow slight dimension difference due to different manual measurement. Package Includes:1 x Mosquito Repeller Bracelet1 x USB Cable