Does it work with a phone app?

No app or remote access is listed. It is a standalone fingerprint knob lock.

Can I still use a key?

The lock is described as a fingerprint lock. No keyed override is listed, so plan for backup access another way.

It is a knob-style lock, so it is meant to replace an existing knob on a standard door. Check your door's bore and backset before buying.

A knob lock alone gives less security than a deadbolt. It is better suited to interior, office or secondary doors.

The listing does not state a fingerprint capacity. Ask the seller before relying on it for several people.

Battery details are not listed. Confirm the power source and battery type with the seller before buying.

At Lowe's, for $147.48, as of our latest check.

$147.48at Lowe'sChecked Nov 11

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