Brand Feature: Portable Finger Trackball Mouse – Off-table design for free and comfortable operation, ideal for laptop users. Helps reduce strain on the palm, joints, and muscles during extended use. Promotes better posture by encouraging a more natural sitting position away from the monitor, helping to reduce eye fatigue. Dolphin-shaped design with ambidextrous left/right click buttons. Plug-and-play functionality—no software required. 2.4 GHz wireless connectivity with an effective range of up to 32 ft (10 m). Includes only the wireless trackball mouse; accessories shown in images are for demonstration only. Specifications: Item Type: Wireless Trackball Mouse Material: Plastic Dimensions: 11 x 6 x 5 cm (4.3 x 2.3 x 1.9 in) Color: Black Sensor Type: Optical (1000 DPI) Power Source: 1 x AAA battery (not included) Wireless Range: Up to 15 m (49 ft) Compatibility: Windows 98/2000/XP/Vista/7/8/10/11, macOS, Linux, UNIX Quantity: 1 pc How to Use: 1. Place your index or middle finger into the trackball cavity. 2. Roll the trackball to move the cursor; use your thumb to press the left or right button. 3. For “Drag and Go” functionality, press the button inside the trackball cavity—this acts as the left-click function. 4. Press and hold the left button to lock the screen, then roll the trackball to scroll freely. Note: 1 cm = 0.39 in. Slight measurement variations (up to 1 cm) may occur due to manual measurement. Screen settings may cause slight color differences between the image and actual product. Package Includes: 1 x Wireless Trackball Mouse 1 x USB Receiver