ISOTRONIC Solar Powered Ultrasonic Pest Repeller, Repel Mosquito Mice Rat Cockroach Marten Bug by Ultrasound Drive out pests without the use of harmful chemicals; German engineering and design No cost in electricity; Solar powered mobile pests repeller (NiMh rechargeable battery included) Compact shape also makes it easy to place Three selectable frequencies: Approx. 7,000Hz repels mosquitoes and fleas; Approx. 10,000Hz repels flies, mice and rats; Approx. 12,000Hz repels cockroaches and martens Dimensions: 3.94" x 3.15" x 1.38" (100 x 80 x 35 mm ); Power: solar module via 1x 1.2V DC 850 mA NiMh rechargeable battery; Operation: On/Off switch, frequency selection switch; Effective range: approximately 269ft (25m) in closed rooms, 20ft (6m) radius in the open