Wireless Finger Handheld USB Trackball Mouse Mice PC Laptop Desktop PC Feature: new and Quantity:1pcs Color: Black Wireless handheld / desktop dual-purpose mouse track, ergonomic design, feel comfortable, trackball mouse and normal mouse design as can hold in the palm of your hand rolling a trackball to move the cursor and such as the use of normal mouse placed on a table, two use intelligent and automatic and the function key is shared. Can not be used to support the use of the desktop, easy to adjust the use of computer posture, reduce the pain of the wrist and cervical spine, as well as the use of ordinary mouse, convenient text input. USB interface, plug and play Compatible with all of the operating system windows and, Unix, systems, etc. Resolution: desktop 1600DPI, track ball 1000DPI The effective distance of 10 meters 2.4GHz interference free design Rechargeable lithium battery Product size: 10.5cm x 6.5cm x 5cm; Package includes: 1 x track ball mouse(with retail package) 1 x USB Receiver Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.