Product Size: 375*77*23.6 mm Battery Specifications: AA Alkaline Dry Battery User capacity: 75 common passwords and temporary passwords, 25 NFC devices, 50 fingerprints Product Safety Level: Class B Operating Temperature: -25~55 Wireless Connection: Zigbee, Bluetooth 5.0 Battery Specifications: AA alkaline dry battery Emergency Power Supply: Type-C 5V DC external power supply Lock Cylinder Specifications: Standard (for 40-80mm door thickness) Lock cylinder security level: Class C Working Humidity: 0-93% RH, non-condensing