Description: Brand new and high quality Feature: Portable finger trackball mouse with off-table design for free and comfortable use. It is ideal for portable users. It can greatly relieve the damage to the palm or muscles during long time using mouse. Avoid sitting close to the monitor and reduce the damage of radiation and eye fatigue. Dolphin-shaped design with left/right clicker fits left and right-handed users. Plug and for play, no software required. 2.4GHz wireless connection with working distance within 32ft (10m). Wireless Trackball Mouse only, other accessories demo in the picture is not included! Specifications: Item Type: Wireless Trackball Mouse Material: Plastic Size: 11x6x5cm/4.3x2.3x1.9in Color: Black Type: With Laser, Without Laser Power: With one AAA battery (not included) Resolution: 1000 dpi Wireless Receiving Distance: About 15M/49ft Compatible with: for Windows 98 2000 XP VISTA Win 7 Linux UNIX for Mac OS, ect. Quantity: 1 pc How to use: 1.Put your index or middle finger into the hole of this mouse. 2. Control the trackball to move the cursor and press the right and left buttons with your thumb. 3. When using the "Drag and Go" function, press the button in the hole of the mouse which has the same function as the left button of the ordinary mouse. 4. Use the left button to lock the screen and then you can control the trackball to scroll the screen freely. Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks! Package includes: 1 x Wireless Trackball Mouse 1 x USB Receiver