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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).
way, you won't miss a visit.
||[marked-for-removal], Not A New Idea, Widely Known To Exist.
||Have a look on eBay, the kit is about USD$200.
||Does it come with programmable ringtones?