Working principle:The Electronic mouse/pest control repeller adopts electromagnetic wave,ultrasonic wave and bionic wave intermittently act on the auditory systems and nervous systems of pests.while safe for human and pets.It can cause maladaptation of the pests,including neurological disorder,loss of appetite,and drooping spirits,and then force them to flee from the field. Effective repels all pests: Mice,rat,cockroach,spiders,millipedes,mosquito,ant,Termite,bedbug,Ladybugs,Silverfish,Wasp,FleasTicks,Cicadas,Cricket,waterbug,Earwig,chipmunk,bird,squirrel,tomcat,snake,scorpion,bat,Lizard,bedbug,moth,mole,flea,pigeon,leech,carpenter ant,Clothes Moth,dust mite,Fruit Fly,stink bug,aphids,woodworm,weevil and more. Selectable bands: 1)Band 1:For light pest infection.The yellow and the green light shine alternatively(human and pets can hear ) 2)Band 2:For severe pest infection.The yellow light and the green light are always on(human and pets can't hear ) Instruction: 1.If you have a hamster pet at home,DO NOT use this Ultrasonic Pest Repeller. 2.To increase the effect, you should use several devices at the warehouse or several rooms. 3.The insect repellent should be installed at 30cm centimeter away from the floor and should be vertical to the floor and plug to the outlet. 4.The installing point should be avoided to be in the back of the curtain,fridge,and any other furniture that deterring or attaching frequency. 5.It's normal that the mouse and vermin will increase at the beginning of the using days because they are getting away from the living place after the attack of the ultrasonic. Usually, it could take 2weeks to notice results.