- The Bluetooth door lock module SN-9243 uses the Tailing Micro-8251 chip with BLE 5.0 to manage door locks and unlocks via the app. Firmware upgrades extend lock functionality and software features. - Remote distribution electronic keys: electronic keys can be sent to tenants at any time; the validity period for each key is configurable; keys can be frozen and defrosted. - Bluetooth unlock via mobile phone: low power Bluetooth enables unlocking from a compatible mobile app. - App control and scheduling: the app lets you set the validity window for each electronic key (start time to end time) within which unlocking is allowed. - Use scenarios: - Property management: assign time-limited access to tenants for lease periods. - Short-term rentals: issue guest keys with defined check-in/check-out windows. - Shared offices or facilities: grant contractors or visitors timed access to specific doors.