Zuosheng  (Red, Pack of 1)

Low Battery Reminder Alert: Red light flashes fast under 20% remaining power plus APP pop-up warning; lock fails to lock below 10% battery. Standard battery lifespan lasts roughly 8 months for daily use. Easy Manual Lock Operation: Finish battery installation & cover fixation, insert physical key then tap lock button; three beeps confirm successful auto-locking after correct setup. Auto Unlock via Bluetooth: Activate auto-unlock mode; lock blinks blue to unlock when paired phone approaches and auto locks as phone leaves. Toggle phone Bluetooth for instant lock/unlock manually. Alarm Cancel & Password Note: Disable triggered alarm by connecting phone Bluetooth & APP near lock. Master password required for device replacement or re-pairing; lost password leads to unavailable lock. Multi-user Bluetooth Pairing: Bluetooth-connected smart lock turns Android phones into virtual keys; supports pairing with multiple mobile devices through official APP.