Waterproof Design: Designed with a unique waterproof structure, this wristband remains functional and comfortable even when wet, making it perfect for daily wear without the need to remove it when washing hands or when it . Multifunctional Mode Settings: The anti-mosquito belt has three different modes: indoor, , which can be adjusted according to the surrounding environment for optimal protection. Simply press the switch to activate and a blue light will indicate its operating status. ADVANCED ULTRASONIC TECHNOLOGY: Our mosquito repellent bracelet utilizes advanced ultrasonic technology to emit 360 sound waves, bionic waves and electromagnetic waves to disrupt the mosquito's hearing and nervous system, effectively driving away mosquitoes without using harmful chemicals. Scientific Principle: Taking advantage of the natural behavior of mosquitoes, where female mosquitoes (blood-sucking mosquitoes) avoid male mosquitoes during egg-laying, this anti-mosquito bite wristband mimics the sound of male mosquitoes, providing a scientific way to repel . Smart Energy Saving: The watch can be via a portable USB port and has a smart chip that can effectively save energy. Once fully , it can be used continuously in standby mode for or has a 6-month shelf life, ensuring you are always protected. Material: plastic colour:A: black Package Contents: 2 x Bracelet 2 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.