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.