Ezviz DL50FVS Face Recognition Smart Lock, Face Recognition with Dual-Lens 3D Structured Light, Built-In Security Chip for Local Processing, Multiple Unlock Methods, Remote EZVIZ App Controls & Alerts, Built-In Smart Door Viewer, C-level cylinder, 4-Inch IPS Color Screen, Live View with Two-Way Video Call, 5,000 mAh Rechargeable Lithium Battery, Supports Emergency Power Supply, Unlocking Method (Face ID, Fingerprint, Passcode, Mechanical key, Bluetooth Key via EZVIZ App, Temporary codes, Remote unlock), User / Fingerprint / Passcode / Face ID Capacity: 50 pcs, 2.4GHz Wi-Fi, Bluetooth, Anti-peeping code, IP54, Type-C Emergency Charging.