Product overview This smart WiFi fingerprint door lock combines fast biometric access with cards, PINs, keys, and app control. Built in aluminum alloy with a tempered glass touch screen, it is designed for residential and light commercial doors where secure, flexible access is required. Key benefits Multiple convenient entry methods: fingerprint, IC card, password, mechanical key, or via Tuya APP over WiFi for remote control and access sharing. Fast and reliable recognition: fingerprint read time 0.1 second and storage for up to 100 fingerprints. Durable, weather resistant hardware: aluminum alloy body with IP66 protection and a tempered glass touch panel. Easy power management: runs on 4 AAA alkaline batteries with low voltage reminder to avoid unexpected lockouts. Flexible installation: reversible handle and a wide compatible door thickness range of about 40 to 110 mm. Main features Unlock modes: Fingerprint, Password, IC Card, Mechanical Key, Tuya APP over WiFi. Capacities: Fingerprint 100 users; IC Card 100 cards; Passwords 50 entries. Read time: 0.1 second for fingerprint recognition. Touch screen: tempered glass for durable keypad use. Core lock level: C Glass. Power: 4 x AAA alkaline batteries, batteries not included. Low voltage reminder included. Operating temperature: 25 to 70 degrees Celsius. Password features: supports virtual password entry to hide real codes. Handle direction: reversible to suit left or right handed doors. Protection level: IP66. Materials and finish: aluminum alloy body; available in Silver or Black. Model DQA6Tuya. Color option example Black B Tuya 8540. Smart home compatibility: Tuya platform via WiFi for remote unlocking, access logs, and temporary codes. Installation and compatibility notes Suitable door types: wooden doors and metal doors, including steel doors. Suitable door thickness: about 40 to 110 mm. Mortise requirement: the distance between the center of the handle and the center of the keyhole, called dimension A, must be 85 mm. If dimension A is not 85 mm, this lock is not compatible with that door. Dimension B is the distance from the center of the handle to the door edge. For example, if A is 85 mm and B is 30 mm, choose an 8530 lock mortise. Attention about remote unlocking: this is a WiFi lock that uses the lock to initiate unlock requests. When you press the number key marked with hash on the lock, the lock sends an unlock request to the Tuya APP, then you confirm in the app to complete unlocking. Remote unlock cannot be initiated solely from the app without the lock initiating the request. Practical applications Home balcony or sliding door where weather resistance and quick biometric access matter. Main residential or apartment doors that need multiple access methods and temporary codes for guests or service personnel. Rental property or office doors where logging and remote access control via Tuya APP simplify management. What makes this lock stand out Combination of biometric speed, RFID convenience, and app control for flexible everyday use. Robust aluminum construction and IP66 protection for outdoor exposure and harsh weather. Clear installation requirement for mortise compatibility to ensure correct fit and reliable operation. Package reminders Batteries are not included. Use 4 AAA alkaline batteries. Verify that the door mortise matches the required 85 mm dimension A before . Confirm door thickness is within the 40 to 110 mm range.