what is the power source?

USB. You can plug it into your computer or a power brick. Unfortunately if you plug it into your computer you can't control the color from an app

Questions & Answers: LED Flash Gaming Mouse Pad RGB Glowing Anti-slip Gamer Grande Mouse Keyboard Mat Expand Keyboard Pad 900*400*4mm /35.43*15.75*0.16 inches

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LED Flash Gaming Mouse Pad RGB Glowing Anti-slip Gamer Grande Mouse Keyboard Mat Expand Keyboard Pad 900*400*4mm /35.43*15.75*0.16 inches

Smooth Gaming-Grade Surface - Slick surface optimal for speed and precision
Superior Pattern - Fancy World Map
Thick RGB Borders - Fully integrated into the borders for minimal fading and max illumination
Water Repellent Coating - Avoid splash damage with water-resistant coating
Improved Stitching - More comfort for those long, intense battles
Non-Slip Rubberized Base - Ensure your mouse pad will stand its ground when you stand your ground
Software Customization - Adjust colors and lighting modes to show off your personality