ARC9016C Alarm Controller   > 16-channel local alarm input (expandable to 256 channels); supports NO/ NC detector, detector tamper, short circuit and mask alarm.   > 4 channel alarm outputs (expandable to 256 channels), along with forced start/shutdown, auto control, and alarm linkage.   > Multiple zone types, such as instant zone, delayed zone, and 24-hour silent zone.   > Alarm input/output port circuit protection.   > Supports fault alarms, including controller tamper alarm, keypad tamper alarm, power failure alarm, battery failure alarm, battery undervoltage alarm, PSTN offline alarm, network disconnection alarm, IP conflict alarm, and MAC conflict alarm.   > 2-channel RS-485 ports; up to 32-channel keypads; printer connection.   > Emergency alarms, such as fire, medical and duress alarm.   > CID (Contact ID Protocol); reuses landline telephone port (personal call requires customized PSTN hardware module).   > Configuration method includes keypad and web; quick configuration guide; remote configuration and search.   > Up to 8 subsystems; single zone and subsystem arming/disarming; arming/disarming with keypad, keyfob, IC card and other methods.   > Supports 3 alarm receiving center at the same time, supports 3 different alarm reporting strategies.   > High-volume log search function.   > Remote update.   > Multiple device recovery methods.   > Two Ethernet ports and two wired alarm centers.

The Dahua DHI-ARA11-W2 Wireless Door Detector is a compact sensor that triggers an alarm whenever an armed door or window is opened. It supports two-way communication, frequency hopping, and AES128 encryption, and can display the open/close state on the DMSS App in real-time. Ideal for villas, shops, apartments, and indoor security systems.