DHI-VTO6521K

• Supports 150 wireless peripherals (6 sirens, 64 keyfobs, and more)

• Peripherals status display: signal strength, battery level, temperature, program version

• Network options: Wired, Wi-Fi, 4G, 3G, GPRS

• Dual SIM, single standby for uninterrupted connectivity

• Automatic Network Replenishment (ANR) ensures continuous connection

• Video linkage via mobile app (DMSS or COS Pro)Two-way wireless communication with frequency hopping for stability

• Cloud updates with automatic recovery in case of failures

The Dahua ARD821-W2 is a compact wireless panic button designed for Dahua alarm systems, allowing users to send an instant emergency alert when pressed. It is ideal for homes, offices, shops, and reception areas where quick alarm activation is important.

The device uses two-way RF communication to ensure reliable signal transmission and confirmation from the alarm hub. It features LED indicators for status and battery alerts, plus protection against accidental presses to reduce false alarms. Its small, portable design allows it to be carried or wall-mounted for easy access.

With secure encrypted wireless communication, long transmission range, and long battery life, the ARD821-W2 provides a simple and dependable way to trigger emergency alarms within a Dahua wireless security system.

• Wireless panic/emergency button.
• Two-way RF communication with alarm hub.
• Instant emergency alarm trigger.
• Multi-colour LED status indicator.
• Anti-accidental press design.
• AES128 encrypted wireless transmission.
• Long wireless range (up to ~1200 m open space).
• Battery level monitoring via app.
• Cloud updates with auto-recovery.
• IP54 dust and splash protection