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, offers high operability in a compact design perfect for mobile use. Comes with a dedicated carrying case for convenient portability. I purchased this, but while the button functions are normal, the trackball does not respond when moved. I am listing this as junk. Power Source: Battery-powered (AAA batteries) Connection Type: Wireless (Bluetooth)