ML300 is a new entry-level fingerprint keypad smart lock with Bluetooth communication. With its compact design and smart core, it amazingly brings a better user experience in all aspects. It's super easy to install on the existing lever or knob of a single-hole door directly and finish the lock's setup with just a few processes in minutes. The additional Bluetooth Gateway allows you to unlock the door lock remotely, check the log history, and share the temporary or dynamic passcode via ZSmart App. More importantly, you can unlock the lock with voice commands when paired with a compatible Amazon Echo or Google Nest device. ML300 will be a wise choice for private houses, junior apartments, and short-term rentals; it creates a more straightforward, smarter, and more convenient lifeParametersCase MaterialZinc Alloy (Level & Front Panel) + ABS (Back Shell)Identification ModeSmart Phone, Fingerprint, and PasscodeUser Capacity100Fingerprint Capacity100Passcode Capacity100Fingerprint SensorCapacitive (silicon)Remote AccessBluetooth Gateway RequiredVoice ControlAmazon Alexa, Google AssistantPower Supply4×AA Alkaline Battery (not included)Backup Power InterfaceMicro-USB Port SupportedBattery LifeUp to 1.5 years (about 10, 000 access)Door Thickness30 - 60mm (standard)BacksetAdjustable 60 or 70 mm (only for single latch)DimensionsFront – 75 * 138 * 23 (mm) Back – 75 * 150 * 27 (mm)Color OptionsSilver / GrayOperating Temperature-20°C to 55°COperating Humidity10% ~ 90% RH (non-condensing)CertificationsCE-RED, FCC ID.