C Size Rechargeable Batteries NiCD 3500mAh Button Top 100% SAFE AND ECONOMICAL Discard your harmful chemical repellent.This electronic pest repeller is safe for human and our lovely pets like dogs and cats. Odorless, noiseless and no radiation, safe for pregnant woman and baby to use. Pest control uses ultrasonic frequency (22-65Khz) sound waves to drive pest and rats away without killing them.Usually ultrasonic repellers take 3-4 weeks to make effect.DUE: If you are finding an instant solution, please select other chemical repellents. EASY TO USE - JUST PLUG IN Please install our item at 80-120cm away from the floor . Just plug our electronic mice repellent into the socket and let it do the rest. And should be vertical to the floor and plug to the outlet. DUE:Please note that if you have a hamster pet at home, please DO NOT use this Ultrasonic Pest Repeller. WIDE EFFECTIVE COVERAGE The Ultrasonic Pest Repellent is effective for an area up to 80~120 Square Meters.Since ultrasonic sound can not penetrate wall and solid object, one room one unit is recommended. As for large storage area with serious pest infestation, additional units is required. USE FOR MANY PLACES This pest control ultrasonic can help you drive away all the pest, like spiders, mice, mosquitoes, rats, roaches, ants, snakes and so on. Suitable for kitchen, living room, bedroom, bathroom, warehouse and basement. 100% SATISFACTION GUARANTEE Ultrasonic pest repellent provides lifetime quality assurance. Any problem we will deal with it for you within 24 hours. We hope this pest repellent will build a warm and comfortable environment for you.