Hausbell Nontoxic Mosquito Trap Non-Chemical Flies Killer Mosquito Inhaler Auto On and Off with Light Sensor Preferable operate in night or in low light environment, without external light source overshadowing product light output or disturbing spectral emission; built in light sensor automatically turns the trap on at dusk and off at dawn (manually-activated also available); Please place the mosquito trap 59-78 inches above the ground to achieve the best result. Tips: How to Use it to the Best Effect--Make Sure you use it in the dark and closed place (close the lights,windows and doors) Place it 0.5~1.0 meters above the ground. Turn on it 2-3 hours before going to sleep, and turn off all the lights in the room. Continuously running it for more then one week to kill almost all mosquito inside the room. Clean once in 2-4 weeks (Dont often open the storage box to clean it) Suitable for indoors and outdoors use. Perfect for living room, kitchen, bedroom, basement, enclosed garage, caf, restaurant, store, office; Outdoor use should be care of not placing it in wet environment. Whisper quiet fan is perfect for baby, infants and the pregnant, no need for toxic insect repellents and insect sprays; no smell, no irritants to lungs like sprays