Hausbell Mosquito Killer,Bug Zapper, Mosquito Trap Nontoxic USB Powered Mosquito Killer Lamp Bug Control Inhaler, UL Listed (3pack) 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. Chemical free: no need for toxic insect repellents and insect sprays; no smell, no irritants to lungs like sprays Designed for indoor use: living room, kitchen, bedroom, basement, enclosed garage, caf, restaurant, store, office, hospital; Attractive design fits nicely in any dcor. Doubles as a very soft glow and pleasant nice-looking night light as you're getting ready to go to sleep; Whisper quiet fan is perfect for baby, infants and the pregnant.