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This is an NB-IoT smart door lock. It features aviation aluminum CNC processing, is anti-violence secure, lightweight, and with an alarm function. Connect to the app to view unlock record, anti-cat-eye unlock and accidental unlock, anti-tailing function and virtual password features. It has six unlock options: via app, fingerprint, password, card, authorization and mechanical key. It features three-dimensional fingerprint recognition technology and learning algorithms.