MUS-TBLF185W Manufacturer's Suggested Retail Price: ¥12,120 + tax Connection Type: Wireless (Bluetooth) Power Source: Battery-powered Other: Multi-pairing This is a mouse where you operate the trackball with your index finger. Operation confirmed. After purchasing it new, I connected it to my Macbook and used it a few times, but I was more accustomed to operating with the trackpad on the PC side, so I ended up hardly using it. The included batteries will be shipped installed in the main unit. I don't know the remaining battery level, but you might want to replace them. This is a used item, so please understand that it is non-refundable and non-returnable.