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. I bought this trackball mouse to try it out, but it didn't suit me, so I'm selling it. I've only used it for about a week, and it's almost new, with 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 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, supports 3 multi-devices】 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.