Product Name: Elecom bitra Mobile Trackball Mouse (Index Finger Operation Type) Model Number: M-MT2BR The "bitra" Bluetooth(R) mobile trackball mouse, designed for index finger operation, achieves high operability while maintaining a compact design ideal for mobile use. Comes with a dedicated carrying case for convenient portability. Buttons function normally, but the trackball does not respond, and the battery cover is missing. This item is being sold as junk. Power Source: Battery-powered (AAA batteries) Connection Type: Wireless (Bluetooth)