... increase significantly,it is the normal appearance.Because the mouse and insect in the nest are attacked by the ultrasonic and electromagnetic waves ... room,computer rooms, places of public entertainment,where cause the wire by the mouse and insect;5.Villas, homes, air-conditioned ... or above(open palce)Weight :128gShape size: 100X86X38(longXwideXhigh) New Style Indoor Electronic Mouse Repeller RC 503