Push-Pull Smart Lock Lockin S30 Pro - a smart door lock that can be controlled both mechanically and with an app. The device has built-in ringer and fingerprint sensor. The smart door lock has 6 modes of operation: fingerprint, PIN code, NFC card, application (Bluetooth), mechanical key and temporary code. Up to 25 NFC cards can be added to the device (sold separately). The mechanism is powered by 8x AA batteries. The device can be connected to the Mi Home application.