Ultraloq UL3 is a modernized keyless lock that offers maximum flexibility and convenience. As you can see from any Smart locks review, this is one of the most durable door locks out there. It’s made from a strong zinc-metal alloy with a single latch and reversible handle that is easy to use. You can access the lock with a fingerprint, a unique code, your knock, or your smartphone. You also have a key in case you need it for manual use.