Features 1、Indoor Plant Spectrum: The warm natural light of USB grow lights is more suitable for indoor plants, the light is soft and not harsh (wavelength from 380nm to 780nm). 2、Space Saving: The full spectrum grow lights can be inserted directly into soil, corners, tables, gardens, etc. without taking up valuable space. 3、Timing Function: The plant growth light control box has a timing function, 2H, 4H, 8H, you don't have to worry about the plants being unable to fill light when you go out. 4、Adjustable Brightness: The brightness of the LED plant growing lamp can be adjusted in 4 levels (25%, 50%, 70%, 100%), which is very convenient and practical. 5、Scope of Application: This plant fill Lamp is suitable for plants with different growth cycles, and also for different plants, which is more practical. Specifications Item Type: Full Spectrum Grow Lights Material: Aluminum, ABS Size: Head: Diameter: Approx. 9cm/3.5in Height: Approx. 1.5cm/0.6in Aluminum Tube Shrinking State: 17cm/6.7in Fully Stretched: 63.5cm/25in Power: 5W Light Brightness Level: 25% 50% 70% 100% (4 Levels of Brightness) Timing: 2H 4H 8H Gross Weight: Approx. 139g/4.9oz Package List 1 x Full Spectrum Grow Light 1 x Telescopic tube