Black mouse, red ball. Product size: 134 * 96 * 48 mm. ERGONOMIC TRACKBALL DESIGN: Equipped with a trackball and sensitive 3-point positioning technology, precise thumb control to move the cursor, no need for frequent wrist movements. Recommended for people with medium to large hands, right-handed. Perfect for drawing, writing, work, gaming, etc. QUIET & ADJUSTABLE DPI: This wireless trackball mouse supports precise cursor speed with 3 levels, from low to high: 1200/1600/2400 adjustable DPI, compatible with notebooks and tablets. Suitable for various tasks, ensuring accuracy and speed. Press the middle DPI button to change it faster or slower. Features silent left and right clicks. Suitable for PC operation in quiet places such as public places, libraries, meetings, or at night. WIDE COMPATIBLE SYSTEMS: A great idea for limited space, works not only on flat surfaces but also on your lap, sofa, bed, carpet, etc. Full control at your fingertips. Color: Black, Red Ball Mouse Size: Medium Plug and Play: Yes Ergonomic Support: Yes