Generic 2.4GHz 1000DPI USB Handheld Wireless Trackball Mouse for Laptop Desktop Handheld Wireless Optical Mice Mouse; Plug and play, no software required. Off-table design for free and comfortable operation. It can greatly ease the harm of palm joint or muscle for long time using mouse. 2.4GHz Wireless connectivity with working distance within 32ft (10m). Dolphin shape design with left/right clickers, fit left and right handed users.