DESLOC K221 Fingerprint Smart Door Lock with Handle – Built-In WiFi, Keypad & App Control, 15000mAh Rechargeable Battery (Up to 16 Months), Auto Lock for Front Door, Garage Entry & Bedroom

Swapping AA batteries every few months is the part of smart locks that nobody warns you about, usually discovered at the worst possible moment. The K221 takes that chore away with a 15,000mAh rechargeable battery rated for up to 16 months on a single charge, so a quick USB charge once or twice a year is all the upkeep it needs. It’s a lever-style handle lock with the fingerprint sensor built in, so you grab the handle, it reads your print, and the door opens, and it also reads dry, worn, or hard-to-scan fingerprints well. A keypad and physical key backups are there for guests or when your hands are full.

Built-in WiFi (2.4GHz) means you can lock, unlock, and check whether the door is open or closed from anywhere in the DESLOC app, and get notifications, without buying a separate hub. Auto lock secures the door when it closes, which is handy for a garage entry door, a front door, or a bedroom or rental unit. An IP65 rating and BHMA Grade 3 certification cover weather, dust, and everyday wear, and the lock is backed by a 2-year warranty with U.S.-based support. For the best battery performance, charge it with a 5V/2A charger rather than a laptop port or low-power adapter. It’s a good fit for anyone who wants a low-maintenance smart lock that works on its own, without a hub and without a drawer full of spare batteries.