Its a normal looking doorbell with a button, however if you are not at home, it sends you an sms.
You can then call that number and have a chat with whoever is on your door, and if you feel like it, maybe even unlock the door remotely with the right password (or other remote control stuff).
This way, you won't miss a visit.-- mofosyne, Jan 09 2012 Yes, this is Baked.
[marked-for-removal], Not A New Idea, Widely Known To Exist.
Have a look on eBay, the kit is about USD$200.-- 8th of 7, Jan 09 2012 Does it come with programmable ringtones?-- RayfordSteele, Jan 09 2012 random, halfbakery