Item Type: Mosquito Repellent Bracelet Material: ABS+Silicone Color: As shown in the picture Bracelet Size: Approx.23.5x2cm / 9.3x0.8in Mosquito Repellent Size: Approx. 3.5x1.5cm / 1.4x0.6in Weight: Approx. 43g / 1.5oz Product Model: F8 Function: Ultrasonic mosquito repellent Input: 5V/1A Built-in Polymer Battery: 100 mAh Output: 34Hz-70KHz Charging Time: About 30 minutes Endurance Working Time: 150 hours The Principle of Mosquito Repellent: The bracelet achieves the mosquito repellent effect by imitating the sounds of female mosquitoes, such as the sounds of male mosquitoes and dragonflies. In nature, the blood-sucking mosquitoes are all female mosquitoes, and they are all in the pregnancy and egg-laying period. In this price range, the female mosquitoes Mosquitoes will avoid male mosquitoes and avoid second conception. So simulating the sound of male mosquitoes can achieve the mosquito repellent effect. 1Pure physical mosquito repellent, green, free of chemical drugs, safer and more environmentally friendly. 2Compact size, easy to carry, suitable for indoors and outdoors , such as seaside, parks, camping, hiking, fishing, etc. 3Whole family can use, old people, children, pregnant women and pets can be worn. 4Intelligent ultrasonic mosquito repellent bracelet, fast charging, standby for a long period of battery life. 5You can carry your bracelet with you, so that you can say goodbye to those nasty mosquitoes and provide you with long?term protection.1. Please allow 1?2in error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1 x Mosquito Repellent 1 x Bracelet 1 x Charging Cable 1 x Instruction Manual 1 x Lanyard Have a great time shopping!