Waterproof Biometric Door Lock with Keypad, NFC, Bluetooth, and Temporary Codes for Bull Head Lock Upgrade

This adaptable smart lock upgrades an old bull head lock into a modern door hardware solution for homes, rentals, courtyards, and iron gates without replacing the whole lock body. It supports biometric sensor, password, card, NFC, mobile Bluetooth, temporary code, and mechanical key entry. The waterproof design is built for outdoor use, helping it withstand rain, damp conditions, and everyday exposure. It can generate temporary passwords through the app for guest entry, cleaning visits, and short-term rentals. Low-power operation, 4 AA batteries, emergency mechanical key entry, and USB emergency power support help keep the lock working when power runs low.