Huion L4S USB Portable 17.7 inch Ultra Slim Adjustable Brightness Art Craft Tattoo Tracing Light Box Pad BoardAbout 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