Check the listing for details. 4 pcs Ultrasonic Pest Repeller Control Electronic Repellent Mice Bug Rat Reject. Color: White, Condition: New. Listed at 10.49 USD. BRAN NEW4PCS Ultrasonic Pest Repeller Control Electronic Repellent Mice Bug Rat Reject NOT FOR ANTS Features: Ultrasonic Electronic Anti Mosquito Pest Mouse Insect Cockroach Repeller RejectHave effect in 80-120 square meters in the room.Can lustrate house mouse, black beetle, mosquito etc.Do not harm to human being and pets.Not have affect on house machine.No-toxic, safety and environment protected.Low energy consumption. Specifications:Color: WhiteInput:110-220V, 50-60HzInput power:5WOutput audio:22-65 KHzUsing environment temperature: 0-40°CSize: 96 x 68 x 30 mm Package Includes:4PCS of Ultrasonic Pest Killer Repeller Notes:1. This machine should be installed at 80-120 centimeter away from the floor, and vertical to the floor and plug to the power socket.2. The installing point should be avoided from carpet, curtain etc attaching sound material. Otherwise, the decrease of the sound pressure will do harm on the effect.3. It’s normal that the mouse and vermin will increase at the beginning of the using days. Because they are moving away from their living place after the attack of ultrasonic.4. To increase the effect, you should use several sets of this machine at the warehouse or goods pile-up, for the best using range is 50 meters.5. It can't drive ANTS away