IMAGE&reg; 2.4GHz Wireless Handheld Rechargable Optical Trackball Mouse with USB Receiver 2.4GHz Wireless connectivity with working distance within 32ft (10m). Hold in hand or place on any surface Plug and Play. Precise optical tracking;Dual design: Works as both a mouse when you place it on you desk and as a wireless trackball(remote) when you hold it in the air. Compatible with: Windows98, 2000, XP, VISTA, win 7, Linux, Unix, Mac OS Trackball comfort: Sculpted shape supports you hand stays in one place move the cursor without moving your arm. Wireless receiver:One tiny receiver that stays in your laptop. Smooth cursor control anywhere:precision tracking on your desk, couch, bed or almost any other surface. For Windows or Mac OS:Control your laptop,desktop computer or home theater PC wirelessly from up to 30ft away. Package includes: 1 x Wire Trackball Mouse, 1 x Receiver, 1 x Bag