Description: Repellent Electronic Bracelet: Intelligent electronic repellent wristband, unobtrusive ultrasound. Create a sound barrier that protects you from bites. Repellent Sound Waves: The bracelet achieves the repellent effect by mimicking the unpleasant sounds of female mosquitoes, such as male mosquitoes and cockroaches.Safe & Healthier: Say goodbye to the herbal bracelets, prevent harmful chemicals, no odor, suitable for Infants/Child/Adult/Old People.USB Charging and Reusable: Built-in aluminum polymer battery, charging for 30 minutes, standby for 30 days, 24 hours of use.Fashion and Lightness: Black and White available, stylish and portable, silicone strap with adjustable skin.Specification:Product Name: Ultrasonic repellent braceletFunction: Ultrasonic repellentInput: 5V/1AOutput: 34Hz-70KHzCharging time: about 30 minutesLife time: 130 hoursProduct color: Black & WhiteMachine weight: 50gFCL weight: 8.5kgMaterial: ABS Plastic & SiliconeSize: Approx. 245x28x10mm/9.65x1.11x0.39inchPackage Includes:2 Pieces Repellent Bracelet2 Pieces Charging Cable2 Pieces ManualNote:Please allow 1-3mm deviation due to manual measurement.(1mm=0.04inch)Color might be slightly different due to the color calibration of each individual monitor.