EM01 is a scientific-based ergonomic trackball mouse. The trackball design reduces hand and wrist movement. Its unique adjustable tilt allows users to choose a 0 or 20-degree angle to instantly improve wrist and forearm posture. Plus, EM01 is equipped with Colorful Rainbow Lighting Technology, which displays a full spectrum of approximately 16.8 million colors and 4 lighting effects. Giving your workstation a unique colorful atmosphere.