Usage Methods: Fingerprint Passcode Access Card Hidden Mechanical Key TTLock App (via Bluetooth) Number of openings with cards: up to 200 cards Number of openings with fingerprint: up to 100 fingerprints Specifications: Battery Type: 4 AA batteries Emergency Charging Port: Micro USB Material: Stainless Steel and Plastic Water and Dust Resistant with IP65 standard Color: Black Warranty: 24 months