IP/TCP communication. Two protocols for communication are Wiegand and RS-485. Supports storing 100,000 users and 500,000 card-swiping records. supports remote unlocking, anti-passback, multi-user unlocking, and multi-door interlock. supports the following alarms: invalid card exceeding threshold, reader tamper alarm, intrusion alarm, unlocking timeout alarm, duress alarm, and incorrect password alarm. supports automatic time fixing, manual time fixing, and built-in RTC. In the event of a power outage, data can be permanently stored and upgraded online. power source via a battery storage device. supports a watchdog system to guarantee the stability of operations.