digio2 MUS-TBLF134BK Bluetooth Trackball Mouse It has a slight used feel, but I think it's in good condition. Please check the photos. It connects via Bluetooth, so a receiver is not needed. There is no box or instruction manual. Operation has been confirmed. ★ Batteries will be removed before shipping. The following is quoted from the product description, but please check the manufacturer's website for details. A Bluetooth communication model highly anticipated by trackball users. It's a perfect match for tablet PCs and PCs with few USB ports. It's the world's smallest class (according to our research) for a 34mm ball thumb-operated trackball. It's easy to handle even for women with small hands, and it's easy to carry around. Despite its small size, it has an easy-to-use form that allows the ring and little fingers to be placed in a natural position. All buttons are silent. You can concentrate on your work without worrying about your surroundings. Convenient 'forward' and 'back' buttons for easy web browsing ※. ※ Not compatible with Mac. ※ Cannot be changed to other functions. Body dimensions/weight: W88 x D95 x H47mm / approx. 106g (excluding batteries) Supported OS: Windows 11/10/8.1/8/7, MacOSX (10.2 or later) Android OS Ver4.4 or later Compatible models: PCs, tablets, and smartphones that support the HID profile Resolution: 450-1200dpi (automatic) / 600dpi (fixed) switchable Bluetooth version: 3.0 class 2 Radio frequency: 2.4GHz band Communication range: Approximately 6-8m radius (varies depending on the usage environment) Power supply: 2 AAA batteries Battery life: Continuous operating time approx. 276 hours Battery replacement indicator: Approx. 636 days Buttons: 5 buttons (4 buttons + wheel button) Connection type...Wireless (Bluetooth) Power supply...Battery powered