Features: 1. Combine the timer and the dimmer into one. 2. With 8 sets of time brightness Settings, timer switch, simulate the different brightness switch of nature. 3. Simulate sunrise & sunset to provide a natural day and night cycle for your fish. 4. Automatically turns your aquarium lamps on and off as you set. 5. Can also be used as a dimmer, the brightness can be adjusted from 0 – 100%. Cautions: 1. Use only the power supply from accessory with DC 5V-30V input. 2. This device is NOT waterproof. Specification: Condition: 100% Brand New Material: ABS + Electronic Components Color: Black Product Size: As Shown Built-in Battery Capacity: 50mAh Note: Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. Thank you for your understanding, nice day! Package Includes: 1 x LED Timer for Aquarium 1 x User Manual