Insect Mosquito Repellent ultrasonic wave generator Mainly for repelling mosquito,flying insects,etc composed of frequency carrier circuit,emitting a hi-frequency ultrasonic 40KHZ±2KHZ,which can stimulate the mosquito,flying insects and damage their nervous system and so as to drive them out. built-in night light can work as normal lighting ultrasonic frequency:40KHZ±2KHZ ; power voltage:AC110/220V Suitable for indoor use,travel,trip,camping,fishing and mountaining,etc. caution: prevent it from water and humidity to improve the mosquito repellent efficiency,please keep the ultrasonic wave's emitting direction to these insects, and the effect will be better if there's no objects between human body and this generator. 4 button cells with LED bulbs efficient range: 3m2 Production Size: 39x69x19 mm Net weight with clamshell: 230g Inner package:blister packing Whole packing Size(mm):130x220x9 QTY per carton:60 pcs Carton size(mm):560x500x210 N.W/G.W (KGS):1.0kgs / 2.0kgs Rated Voltage:DC 6V