HE unit is available for the mosquito, cockroach, mice, flies ,ants, beetles and etc.insects. It is controlled by microcomputer and carrier frequency pulse circuitry,transmit 10 ~ 30 KHZ high frequency ultrasonic to effect on mosquito and spider which the ultrasonic can be stimulate the insects’brain . The unit has a swept function which can swept from 10~30 khz automatically and continuously,make the mosquito ,spider etc,: difficult to suit for one frequency. No smell, No poison , No fumes Non-audible and no side effect to human. Built in nightlight,it can be light in dark room.