Honeywell 8832301S Bluetooth Entry Bolt and Door Knob

Yes, must be under a covered entry. Not out in the elements.

It's more pewter silver looking than champagne.

Yes, this can be added to your already installed deadbolt. Then,
you'll have double security.

You can assign them a code to unlock door. You can not
remotely open door. You can assign a code for a length of time,
then it won't work after that date.

You can create and send permanent, temporary (timed) or one-
time use Bluetooth ekeys and digital pass codes to anyone
from anywhere with your smart phone.