On-the -fly Adjustable DPI- 12 DPI levels available from 200 to 4800, can be saved up to 6 gears, click the + / - buttons easily adjust X9 to instantly match mouse speed to different scenes, actions in the gameplay. Ergonomic Design,Ultra-comfortable- Ergonomic curved shape makes X9 fits into the palm of the hand, reduces muscle tension, ideal for continuous use, long-time use and everyday use.