Depends on the batteries...a 4 pack of name brand alkaline's from Target should get you between 10,000 and 18,000 cycles or about 1-2 years. I haven't tested with some of the crazier 22,000mAH ones one can get through Industrial resellers

>>What kind of wireless link do you use?

For the residential units, the server talks to the door lock using the same protocols found in car fobs.

For the commercial systems, we use electrical strikes. There is no wireless communication. We manually trip a relay.

>>Does the lock poll the base station?

Receive only.

>>How do you traverse the home firewall?

Encrypted Tunnels

>>Do you poll continuously?

Push