Ultrasonic Electronic Pest Anti Mosquito Repeller Keychain Ultrasonic mosquito repellent is an imitation of the frequency of male mosquito predators dragonfly or driven to achieve the effect of female mosquitoes bite a by product. It is safe, non-toxic, completely harmless to humans and animals, without any chemical residue-free, is home travel, fishing, barbecue, camping, shade ideal companion. The Ultrasonic Mosquito Repeller uses an advanced technolgy insect repellent that makes outdoor living and activities more enjoyable keeping away from the annoyance of mosquitoes. It works to help protect you while you're fishing, camping, hiking, jogging, on the golf course. Effective range of about 6-8 feet Specification : Color : Silver Material : Plastic + Electronic Components Dimentions : 5.5*3.5*1.5CM Weight : 25g How to use: Open the battery cover and install a CR2032 coin cell battery with the literal outward Switch to the right for the simulation of the middle voice of dragonflies and bats. Allocated to the right location for the simulation of sound public jitter mosquito wings. Package Included 1 x Ultrasonic Mosquito Repeller 1 x Cell Battery ***If you have any question, please email us. Customer satisfaction is very important to us! Please contact us before leaving any negative or neutral feedback or dispute on Paypal because it will hurt both of our benefit. Please give us the opportunity to resolve the problem. We understand the concerns and frustrations you might have, and we will try our best to resolve the issues.