Description: Name: Ultrasonic Mosquito Meter Product Model: M30 Function: Sonic Repellent Input: 5V/0.5A Output: 34Hz-70KHz Battery Capacity: 80mAh Charging Time: About 30 Minutes Durable Working Time: 150 Hours Product Color: Black, White, Blue, Pink Single Package Size: 32*52*78mm Total Weight: 36.5g Packaging: 210*280*430mm Features: 1. Principle Of Repelling Mosquitoes: The Bracelet Achieves The Effect Of Repelling Mosquitoes By Imitating The Sounds Of Female Mosquitoes, Such As Those Of Male Mosquitoes And Dragonflies. 2. In Nature, Blood-sucking Female Mosquitoes Are In The Stages Of Pregnancy And Egg-laying. The Female Mosquito Will Stop The Male Mosquito And Avoid Secondary Pregnancy. Therefore, The Cry Of Male Mosquitoes Can Achieve The Effect Of Repelling Mosquitoes. 3. Pure Physical Mosquito Repellent, Non-chemical Mosquito Repellent, Safer, More Environmentally Friendly And Healthier 4. Can Be Worn By The Elderly, Children, Pregnant Women And Pets 5. Can Be Worn Indoors And Outdoors, At Sea, In Parks, Camping, Mountain Climbing, And Fishing. Package Included: 1*Mosquito Repellent (including 6 Pieces Of Mosquito Coils) 1*Bracelet 1*Charging Cable 1*User Manual