Non-toxic , environmental friendly Safe and odourless 22-65kHz of repelling using ultra sonic frequency, covering 80-120 sqm This device can be plugged directly to an AC 220V power socket (power range AC 90 to 250 V , frequncy 50-60 Hz. Do not place near to carpet or curtain as it will not be effective in driving away pests. You can increase the effectiveness by placing more than 1 in different parts of the room.