This Mini LED Strobe with Thunder is battery operated. Unit includes: Try Me button. For indoor use only. Unit measures approximately 3.5" wide x 2" high (4" with mounting bracket up) x 5" deep. Switch can be set to strobe only, sound and strobe or OFF. Uses (3) - "AA" Batteries (included). Sound noises include: Wind and thunder, Doors slamming, Electricity, Scary laughter, "Help Me!", Bubbling cauldron, Witch cackling, Werewolf howling. Unit is ETL Listed.