If you've already outfitted your home with the Star Trek-styled pneumatic sliding door, ThinkGeek has just the item to install on the wall beside it — the Star Trek electronic door chime. An essential item for any Trekkie's home, the chime mounts next to your door and is activated any time someone crosses the threshold; you can set it to either play the signature "swooshing" door sound or set off a more noticeable "red alert." You'll need 6 AA batteries to power this device, and It's not entirely clear how you mount this device to your wall, but if you're passionate enough to install this in your home, we're sure you'll figure it out.