Huion L4S USB Portable 17.7 inch Ultra Slim Adjustable Brightness Art Craft Tattoo Tracing Light Box Pad Board About the product 1. This is the simple types of Huion Light Pad. With only USB powered, you just need to connect it with your computer. 2. The dimming is gradual, not in steps like low, medium, and high. Also, after you turn it off and restart it, it remembers your last setting and restarts at that setting. 3. It's A4 size and 5mm super thin as well as the acrylic surface makes it feel like a glass panel and .With super bright LED lamps inside, the light pad provides a maximum of 1500 lux of brightness which can see through very thick paper. 4. The LED Light pad is designed for everyone whether you are an enthusiastic amateur or a professional artist. Eyesight-protected Technology is designed in it that's perfect for sketching, drawing,animation making,calligraphy and tattoo tracing. Features 1. Special acrylic anti-scratch and anti-slip for professional artistic design 2. Hidden LED design, the unique light patterns provide enough brightness and diffuse reflection effect by joining the middle tile open honeycomb cushion, which make the light more mild and at the same time, protect users eyesight 3. The auxiliary settlements are practical and dependable, while the surrounding degree marks are precise and accurate 4.USB connected. Comes with an USB cable, which means you can not only plug it into the wall charger, but also your computer.