Overview: The mosquito repellent wristband can achieve the mosquito repellent effect by simulating the sounds that make female mosquitoes unhappy, such as male mosquitoes and cockroaches to protect you from mosquito bites no matter where you are. No chemicals, no odor, it is safe for baby and kids to use. Note: Life waterproof, please do not immerse it into water or wear it when having a bath. Different Options: Model: M1, without digital display, black or white color optional Model: M2, with digital display of time, black or white or pink color optional Model: M20, with digital display of time and body temperature, black or white or pink color optional Specification: Type: Mosquito Repellent Wristband Input: 5V 1A Frequency: 34Hz-70KHz Battery: 3.7V 90mAh polymer battery Charging Time: about 30 minutes Working Time: about 130 hours Item Size: 25.0*3.1*1.25cm/9.84*1.22*0.49in Package Size: 10*6*4.5cm/3.9*2.4*1.8in Package Weight: 50g/1.76oz Package List: 1 * Bracelet 1 * USB Cable 1 * User Manual