Ultrasonic Technology: Using biological sound waves (ultrasound + bionic waves), the double wave ring overlaps readings and can imitate the sound of female mosquitoes (male mosquitoes and cockroaches) to achieve mosquito repellent. /p> Safety: Our electronic mosquito repellent bracelet, with ultrasonic waves to create a purely physical mosquito repellent, without chemical ingredients, safer, more environmentally friendly, safer and healthier, the old people, children, pregnant women and pets can wear it. USB Charging: Rechargeable mosquito repellent bracelet with built-in smart chip, USB fast charging, 30 minutes charging, 30 days of standby, 150 hours of use, save time and energy, effectively avoid more than 90% of mosquitoes. Three modes: press the switch once to activate indoor mode; press again to switch to outdoor sport mode; press a third time to activate wide use: whether you're camping, fishing, hiking or jungle in the park, the smart mosquito repellent is the best mosquito repellent formula for the jungle as a float for baby or adult waterproof cape, wear it in a cot, camp chair for kids or toddlers, swimming aids, good body board. Accessories.