A4 Ultra-Thin Light Box LED Artcraft Eye-protecting Tracing Light Pad with Seperate Scaled Panel Holder Clamp Stepless Dimness USB Cable for Tatoo Diamond Jewel Paint Drawing Sketching Animation Features: Power supplied by USB cable, convenient to access to any USB port like computer, USB plug or even power bank. 11.8 * 8.5" illuminated space,  super bright, and flicker free, lightweight and portable. Stepless dimming with brightness memory function for your next use, meanwhile the light is eye-protecting and efficient. This item features it's separate scaled board, you can use it as you need. A clamp for fixing the separate board and drawing paper and make it fixable on the surface. High transparent acrylic panel with great toughness & durability. Suitable for medical imaging, animation, tattoo, garment, diamond drawing, art, etc. Specifications: Material: Acrylic Light Source: LED Illuminated Space: 30 * 21cm / 11.8 * 8.in (W * L) , 36cm / 14.in(Diagonal) Working Voltage: DC 5V Interface: Micro USB (like computer interface, power tank, etc.) USB Cable Length: Approx.2m / 78.in Item Size: 21.5 * 33 * 0.35cm / 8.5 * 13 * 0.1in Package Size: 36 * 24 * 3.5cm / 14.1 * 9.4 * 1.in Package Weight: Approx. 440g / 15.5oz Package List: 1 * Light Pad 1 * USB Cable (2m/ 78.7") 1 * Scaled Board 1 * Clamp Note: For power supply, we just supply you with a USB cable, you can powered with the universal phone adapter, power tank or other USB interface. The package only includes the light board , USB cable, scaled board and clamp.