One door bell with 20 push buttons, how can i make this?

Question

I am trying to find is it possible to make a door bell with several remote push buttons,for example employees keep remote push button in there cars when they reach near entry gate they just press button and the Bell rings in Security shack

Answer 1

yes, you just have to get them all set on the same frequency

Answer 2

The "push buttons" must be all coded to the same code, of if they are all different codes, the reciever (dooe bell) must be set to accept 20 different codes.

see here for bell http://www.maplin.co.uk/module.aspx?TabI...

its L45BN

and extra buttons L47BN