Features: 9W single-head, 18W dual-head or 36W 4-head grow light for option. High-quality LED, long lifespan. Adjustable clip, clamp on anywhere stable. Blue and red spectrum which supplies the most efficient wavelength to enhance photosynthesis performance. Timing switch, 4H/ 8H/ 12H timer set, 3 light modes, 5 adjustable levels of brightness. Durable and IP66 waterproof. Circular memory function, in the case of uninterrupted power, you can set it up to turn off after 4H/ 8H/ 12H. It will automatically turn on every day according to the time you set. 360 flexible gooseneck that can easily adjust the angle and distance between light and plants. Note: USB cable can\'t be removed, it\'s linked with the clip.