Two Types Of Power Supply And Long Life: Powered; By 3 Aa Batteries (Not Included); Or Use The Usb Cable We Provide. The Led Light Has A Long Lifespan Of Over 30,000 Hours, Three To Three Hours. Four Times More Than Normal Halogen Lights. Applications: This Jellyfish Tank Light Has Soft, Gentle Light To Soothe Your Mind. Very Good For Bedroom, Home, Bars, Cafes, Restaurants, Wedding, Party. It Is Also The Perfect Lighting Tool At Night. May Your Night Be Full Of Brightness. This Is A Very Good Night Light For Kids. Energy Saving Design: It Will Shut Off Automatically After Working Four Hours, Can Greatly Save Energy. You Need To Press The On/Off Button To Make This Jellyfish Tank Light Restart. Easy To Use And Colorful Mutation Light: There Are 2 Buttons On The Top Of The Lid. Press On/Off Button, It Is Automatic Color Changing Mode. The Light Alternates With Time; Further Press The Light Button, You Can Manually Change The Led Display Color. The Color Changes Cyclically As Follows: Red, Blue, Green, Red, Blue, Red, Green, Automatic Colorful Change. . Silent And Perfect Gift: Works Well, No Noise, Db40. The Beautiful Jellyfish Floats Gently In This Realistic Aquarium. Create A Calming Atmosphere, Realistic Peaceful Movements That Can Help You Relax. Find Peace Of Mind. This Is The Perfect Gift For Children To Recognize The Marine World.