Designed to clip on up to 5 gallon rimless nano aquariums Built-in Timer: three timing modes: 3, 9, 12 hours; Short press the alarm icon to choose the time, light will automatically be off and on at the time you set Adjustable brightness: 10 levels of brightness ranging from 10% to 100% brightness, you can create the most perfect mix of light and tank environment, no more worries about too bright and too dark Three Modes: Mode 1: Day mode with all LEDS on, powerful brightness to illuminate every detail in the tank; Mode 2: Warm white LED on, soft light gives natural light-like illumination to the tank; Mode 3: Night mode with Red + Green + Blue LEDS on, make fish and plants more colorful Soft arm can be adjusted by any angles and positions; Suitable for rimless tank with glass up to 0.25" thick. It can be used with 10W MAX power adapters. (Adapter NOT Included)