Features:1. Change of Colors of key on the keyboards: Purple， Red， Blue by pressing lighting Fn+SL button.2. Ergonomics， Comfortably and easily operation3. Waterproof4. Ideal Gaming Companion with strong multi-media functionSpecifications:Windows98/XP/Win7/Win8， etc.Net Weight: 800gUSB: USB lineLoad-bearing of the key: 65gKey Life: >1000W timesSway Test: >3000 timesRoute of Key: 3.6mmVoltage: 5VCurrent: 50mADimension:500(L)*215(W)*45(H)mm Cheap one optional : https://www.wish.com/c/559ce54803ffd361c41038ca