How the Flea Trap Light Works Effectively? * The principle of flea traps is to use light, heat, color, sweat odor and the phototaxis and thermotaxis of pests to lure flea and other pests from 50 feet away. * * Once they enter the flea trap, they will be firmly stuck with the glue board and cannot escape. * * Trapped fleas help break the breeding cycle and alert you to potential infections. * * Also helps detect if flea infestation arose especially in areas you can’t spray. The indoor flea trap is perfect for home use, such as bedrooms, living rooms, kitchens, dining rooms and pet house. Warming Tips: 1. Prohibited to use outdoors or in humid environments! 2. Don't cover the flea trap when working. 3. To replace the bulb or sticker, please turn off the power first. 4. Flea traps are great for continued use. If the plastic refill is 3 weeks old or has 70% coverage of pests, you can replace it with a new sticker.