Innovative mouse/trackpad combo with full support for Apple's multi-touch gestures. Uses Bluetooth and runs on two double-A batteries (and you can use rechargeable NiMH, which I've been doing.) It should also work in Linux and Windows (with a downloadable driver) as well as Mac OS/X. This mouse suffered some battery leakage which corroded the metal on the bottom a bit, hence the low price. I have STOPPED the corrosion and cleaned up all the alkaline battery leakage with vinegar & isopropyl to neutralize it. It still works 100% fine & looks perfect from the top. Only selling because I prefer a more traditional scroll wheel. If you are reading this ad, it's still available. Quadra & Bay area. No need to drag things out, just email, come, and pick it up.