Function:1.USB interface can connect to any USB port, easy to turn on/off via USB cable. 2. It has 3 dimming capabilities which can be dimmed according to your needs. 3. The protective design of the light box is equipped with energy-saving and flicker-free LED lights, which makes the surface perfectly and uniform. 4. Improve drawing skills, help children write letters and numbers, and interested in art, diamond painting, painting, calligraphy, drawing, graffiti art, etc. 5. Easy to carry, ultra-light, ultra-thin, adjustable brightness. Simply press and hold the touch switch for a few seconds until it reaches your desired brightness. This is a gradual dimming effect. Specifications: Item Type: A3 Light Board Material: Acrylic + Plastic Weight: Approx. 704g/24.8 Thickness: Approx. 0.4cm/0.2" Gear Count: 3 Gear Light Source: LED Directions: Plug in power, press the power button to use. Brightness is adjustable. Simply press and hold the touch switch for a few seconds until it reaches the desired brightness. This is a gradual dimming effect. Package list: 1 x Lightboard 1 x USB Cable Note: Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.