Includes a polite and easy-to-understand Japanese instruction manual. Bluetooth/USB receiver connection, 4-level DPI adjustment, rechargeable, thumb operation, ergonomic design, 6 buttons (forward/back), wireless mouse, compatible with Windows/Mac, red ball. Used only for a few minutes. Almost new - no scratches or dirt. 【Wrist-friendly, Ergonomic Design and Thumb Operation】 With a trackball mouse, you can operate the cursor without moving your wrist or arm. Smooth movement with your thumb reduces muscle strain. At a natural angle, you can use it comfortably for long periods. 【Precise Tracking & 4-Level DPI Adjustment Function】 High-precision sensor and smooth trackball allow for stable operation even on beds, sofas, and narrow desks. DPI can be adjusted in 4 levels. Recommended for precision work and working from home. 【Bluetooth/USB Connection & 3-Device Multi-Device Support】 A mouse that can connect to up to 3 devices. Easily switch between Bluetooth or USB receiver. Compatible with both Windows/Mac, making device management for work and hobbies smoother. The 2.4G USB receiver is stored at the bottom of the wireless mouse. 【Rechargeable Battery, Long-lasting & Economical】 The Nulea Bluetooth mouse does not require batteries. The large-capacity built-in battery allows for months of long-term use. Easily charge with a USB cable. Experience the freedom of wireless anytime, anywhere. 【Multi-functional 6-Button Design for Comfortable Operation】 The Nulea wireless trackball mouse is equipped with 6 high-performance buttons, including "forward" and "back" buttons. The ergonomic shape provides a natural hand fit and high productivity. For all users seeking comfort and efficiency. The ball can be easily removed and washed.