This is from Apples's site:
Using AirDrop with OS X Lion, Mountain Lion or Mavericks
AirDrop requires that both Mac computers include Wi-Fi hardware that supports AirDrop mode. Both Mac computers need to have OS X Lion or later installed.
To see if your Mac works with AirDrop, make sure you’re in the Finder by clicking the desktop (the background area of your screen), or by clicking the Finder icon in the Dock. Then, check to see if AirDrop is listed as an option in the Go menu. If you don't see AirDrop listed, your Mac doesn't support this feature.
You won't be able to receive AirDrop files if you have enabled "Block all incoming connections" in the Security & Privacy pane of System Preferences.
Macs that include AirDrop support are the same as, or newer than, the models listed below.
- MacBook Pro (Late 2008 or newer)*
- MacBook Air (Late 2010 or newer)
- MacBook (Late 2008 or newer)*
- iMac (Early 2009 or newer)
- Mac Mini (Mid 2010 or newer)
- Mac Pro (Early 2009 with AirPort Extreme card, or Mid 2010)
*The MacBook Pro (17-Inch Late 2008) and the white MacBook (Late 2008) do not support AirDrop.