Feature: 1. The USB interface can be connected to any USB port, and the power can be easily turned on/off via a USB cable. 2. With strong, medium and weak three dimming function, can be dimmed according to your own needs. 3. Protective design, the light box is equipped with energy‑saving non‑flicker LED lights, and the surface is perfect and uniform. 4. Improve drawing skills, help children write letters and numbers, and be interested in art, diamond painting, painting, writing calligraphy, drawing pictures, graffiti art, etc. 5. Easy to carry, ultra-light and ultra-thin, adjustable brightness, just press and hold the touch switch for a few seconds, until you get the brightness you want. This is a progressive dimming effect. Specification: Item Type: A3 Light Board Material: Acrylic + Plastic Weight: Approx.704g/24.8oz Thickness: Approx. 0.4cm/0.2in Number of Gears: 3 Gears Light Source: LED How to Use: Plug in the power and press the power button to use. The brightness can be adjusted, just press and hold the touch switch for a few seconds until you get the brightness you want. This is a progressive dimming effect.. Package List: 1 x Light Board1 x USB Cable Note: Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.