Description: Intelligent ultrasonic mosquito repellent bracelet Pure physical mosquito repellent, green Fast charging, standby for a long period of battery life Simulate specific sound frequencies and remove mosquitoes Efficiently drive 70 percent to 80 percent of mosquitoes Whole family can use. Does not contain any toxic chemicals. Long-term mosquito repellent Bracelet. Item Category: Mosquito Repellent Bracelet Input: 5V or 1A Output: 34Hz-70KHz Charging time: about 30 minutes Life time: 130h Color: black, white Specifications: Pure physical mosquito repellent, free of chemical drugs, safer and more environmentally friendly. Old people, children, pregnant women and pets can be worn, easy to carry, indoors and outdoors (seaside, park, camping, hiking, fishing, etc.) Package Included: 1 bracelet 1 charging cable 1 instruction manual Notes: 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.