IMAGE&reg; 2 in 1 Wireless Handheld USB Optical Trackball Mouse - Rechargable 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 wireless trackball mouse 1 X receiver 1 x bag