Smart ball door lock with fingerprint, mechanical key, and mobile phone unlocking. Remote unlocking available via Tuya app. Installs as a direct replacement for an existing ball door lock without drilling. Automatic locking removes the need to worry about leaving the door unlocked. Key benefits Multiple unlocking options for everyday convenience: biometric fingerprint, mobile phone unlock, and mechanical key override provide flexible access without relying on a single method. Remote access and management: compatible with the Tuya app for remote unlocking and basic remote control and user management. Simple retrofit installation: fits over existing ball door lock hardware so no drilling or major modification is required. Automatic locking: the lock secures the door after use, reducing the chance of accidental unlocked doors and improving daily convenience. Reliable daily performance: designed for frequent use with quick recognition and straightforward operation. Main features and attributes Function: biometric fingerprint unlocking, mobile phone unlocking, mechanical key override, remote unlocking via Tuya app, and automatic locking. Compatibility: designed to existing ball door locks without the need to drill; compatible with typical ball lock installations. Design and fit: ballshaped door lock designed for direct retrofit installation on existing lock hardware; installation preserves the original door finish and hole layout. Operation: fast biometric recognition and immediate mechanical override when needed; automatic relock function engages after the door is closed. Integration: works with the Tuya app for linkbased remote unlocking and user management; mobile phone access is available locally or via the app as configured. Practical use scenarios Home entry: Families can use fingerprints for everyday access, allow guests temporary remote access via the Tuya app, and rely on the mechanical key as a backup. Shortterm rentals and property management: Owners can remotely unlock the door for arriving guests through the Tuya app and set up temporary mobile access without changing existing hardware. Small offices and shared spaces: Provide employees with fingerprint access for convenience and assign temporary phone access for contractors or cleaning staff while retaining a mechanical key override. Installation and user notes Designed for direct replacement of an existing ball door lock; no drilling required in most installations. Supports biometric fingerprint unlocking plus mobile phone control and mechanical key override for redundancy and convenience. Remote unlocking requires configuration with the Tuya app according to the included setup instructions. This lock is intended to simplify secure access, reduce the need for multiple physical keys, and allow remote management when paired with the Tuya app, while fitting directly onto existing ball door lock hardware without drilling.