4 in One Ultrasonic Pest Repellent, Electronic Repeller for Insects-effective for Rats, Roaches, Scorpions, Mosquitoes, Spiders, Fleas, Bees, Most Ants, Bats, Other Small Rodents and Insects *ULTRASONIC- it's use a ultrasonic sound for keep your place safe from nasty INSECTS And the sound is safe for HUMAN. *ELECTROMAGNETIC- Plug-in into any wall power outlet in your place and it will use power to keep you safe from the insects. It takes power to make the ultrasonic sound. *EFFECTIVE- for RATS, MICE, ROACHES, SILVERFISH, EARWIGS, SCORPIONS, MOSQUITOES, SPIDERS, FLEAS, TICKS, BEETLES, MOTHS, BEES, MOST ANTS, SQUIRRELS, BATS, OTHER SMALL RODENTS AND INSECTS *CHEMICAL or POISON FREE- It's completely chemical free so no harm to you and your family, children and the pets. *SAFE & EASY- It's very easy to use and it's completely safe.