The BioKnobTM looks like a regular doorknob but at the center is a tiny sensor that registers a user's thumb or fingerprint patterns. Up to 100 users can have their fingerprints stored in the BioKnob for entry.
Users no longer have to carry keys, or worry about losing or forgetting them. Families do not have to hide keys in the yard, or maintain duplicate sets of keys. Most importantly, there is no danger of strangers finding or stealing keys for unauthorized entry. Short-term guests can have their fingerprints enrolled, then individually deleted, without worrying about keys.