The killer is designed with power saving, decorating, soft lights, so it should be used in a place without strong lights -- using the killer in bed-room without turning on any other lights for 10-20 minutes, or put the killer in the darkness under a table while studying, are all good ways to use this killer.
2. The suggested using height is 0.8-1.2m, and the distance to wall should over 0.3 meters. The best method is to put the killer before a door/ window or any other place where easy to kill mosquitoes.