Ultrasonic principle: The wristband is made of lightweight skin-friendly and soft TPU material. The strap is adjustable and lightweight. It is comfortable to wear. The bracelet can imitate the sound of insects and effectively drive mosquitoes. Suitable for outings, travel, business trips, etc., to avoid mosquito harassment. Physical mosquito repellent: The watch mosquito repellent is designed and developed for the frequency of all pests. There is no need to worry about the impact on the human body, no smell, no noise, no radiation, and it can be used by the whole family. Mosquito repellent effect is significant, more suitable for infants and young children, even pregnant women and pets can be used. USB mosquito repellent bracelet: built-in polymer lithium battery, without frequent battery replacement, can work continuously for 60 hours, lasts for 25 days, built-in smart chip, all-day smart drive low-power operation, saving power. IP67 waterproof mosquito repellent bracelet: swimming can also be worn with confidence, IP67 waterproof and dustproof level, not only can protect against particulate dust in daily life, cosmetics, sweat and other corrosive substances, you can even directlywash with water and wear when swimming. Effective mosquito repellent: built-in smart chip, write various effective sound wave frequencies into the chip, the effect of mosquito repellent is more significant, the combination of three sets of frequency conversion frequency oscillation frequencyand timing automatic shutdown, to better drive all kinds of mosquitoes The mosquito repellent effect can reach 1 meters, which is harmless to human body. Delivery Quantity: 1pc Package Contents: Only the above package content, other products are not included. Size: 25.5*2.7*1.04cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: White (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)