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.