RAPOO X120pro - Wired Keyboard and Mouse Combo Optical Combo Black - 1600dpi Laser carved keycap Keycap printing adopts laser carving technology that makes it wearable, durable and long lifetime. Spill-resistant design Spill-resistant design of the keyboard, so you don’t have to worry about the keyboard stop working with accidental spills 1600 DPI tracking engine You’ll enjoy responsive and smooth cursor control with the 1600 DPI high-definition optical tracking engine. Anti-oxidation sealed membrane The sealed membrane ensures a longer keyboard lifetime.It prevents oxidizing of the inside circuit, which may cause defect keys.