Description: Intelligent ultrasonic mosquito repellent bracelet. Fast charging, standby for a long period of battery life. Simulate specific sound frequencies and remove mosquitoes. Efficiently drive 70% to 80% of mosquitoes. Fasting Charging, Charge one for 130 hours. The bracelet can repel mosquitoes by imitating the disgusting voices of female mosquitoes, such as male mosquitoes and dragonflies. It is safer, safer, safer, more environmentally friendly and healthier. Old people, children, women and pets can be worn. Portable products can be worn indoors and outdoors (seaside, park, camping, mountain climbing, fishing). Specification: Input: 3.7V/1A Output: 34Hz-70KHz Battery capacity: 70 mAh Charging time: about 30 minutes Flight duration: 130 hours Size: Approx. 25x3x1cm/9.84x1.18x0.39inch Package Includes: 1 Piece Bracelet 1 Piece Charging Cable 1 Piece Instruction Manual Note: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. Please leaving a message before you give the bad feedback, if the products have some problems. Thanks for your understandings.