Features: Ultrasonic mosquito repellent wristband made of skin-friendly silicone material can effectively make mosquitoes flee away and protect kids anytime anywhere. It produces ultrasonic wave to affect mosquitoes\' auditory and nervous system, and also produces bionic wave to imitate sounds that mosquitoes hate. With detachable wristband and hanging ring, it offers kids multiple ways to wear. They can wear it on wrist and ankle comfortably, or hang it on the schoolbag easily. Mini size, portable and lightweight, rechargeable and cordless. It can be widely applied in home life, school life, camping, traveling and more outdoor activities. Adopts physical method instead of chemical method for safe use. No sound, no chemicals, no poisons and odorless, safe to both mothers and babies. Note: Size and color may be slight different beacuse of manual measurement and different light conditions or other reasons, please in kind prevail. Thank you.