Specifications: Material: plastic, meta Mouse size: approx.10 * 10 * 4cm/3.94 * 3.94* 1.57inch Diameter of track ball: approx. 4.5 cm/1.77inch Network interface: wire Connection method: wire Package Included: 1 x LED trackball mouse 4 x Screws Note: 1. The product you received can be installed by yourself. 2. Due to manual measurement, please allow 1-3cm error, please make sure you don't mind before ordering. 3. Due to different monitor, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.