Illuminated 4.5cm Round LED Trackball Mouse PS/2 PCB Connector For Arcade Features: Made of plastic, not easy to age, durable and reliability, with long serving life. Low cost real trackball works with any PC application. Can be used on a PC as a mouse or connected to your game console. This LED trackball mouse features with smoothly trackball rolling action. This trackball mouse size is unified in the game console, which can satisfy the design of various game console. Specifications: Material: plastic, metal Mouse size: approx.10 x 10 x 4cm/3.94 x 3.94 x 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. It doesn't support for Windows 10 system for the PC2. The product you received can be installed by yourself. 3. Due to manual measurement, please allow 1-3cm error, please make sure you don't mind before ordering. 4. 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.5. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.