3 Unlock Methods, Convenience and Security: Fingerprint door lock offers 3 unlocking methods: fingerprint password and physical key. With a fingerprint recognition rate of up to 98%, it can open the door in just 1 second. You can add up to 50 fingerprint groups, eliminating the hassle offorgetting your keys Voice Navigation Function, User-Friendly Operation: Door lock handle features voice navigation with bilingual support (ChineseEnglishSpanish), making it suitable for different users. The voice prompts guide users through setup and operation,reducing the risk of errors and making it especially friendly for the elderly and children Emergency Charging Port, Long-Lasting Power: Powered by 4 AAA batteries (not included), fingerprint door knob features a low battery reminder and a Type-C interfacefor emergency charging, ensuring your lock is always ready DIY Installation, Strong Compatibility: Door lock with keypad designed for US standard doors, it fits backsets of 2-3/8 (60mm)