Loxbox

Providing a house key for use by rescue personnel.
The Wheat Ridge Police Department provides lock boxes similar to those used by real estate agents to hold a spare house key. Your address and the lock box combination are stored in a secure police computer file.
If the police, ambulance, or fire personal are called to your home due to a concern about your well-being, the computer automatically notifies the police dispatcher of the location of the lock box and the combination.