🧰 Technical specifications
• Model: DHI-ARM9A4-W2
• Type: Dahua Wireless Multi IO Transmitter
• Scenario: Indoor
• Alarm inputs: 16 local alarm inputs
• Input support: NO / NC, 0EOL / EOL / 2EOL / 3EOL
• Pulse detection: Channels 1–6
• Maximum cable length: 500 m
• Alarm outputs: 4 relay outputs (Max. 30 VDC, 3 A)
• Auxiliary power outputs: 2 outputs, 14.5 VDC, total 2 A (24 W)
• Storage battery support: 12 V / 7 Ah (optional, not included)
• Indicator light: 1 × Status indicator
• Button: 1 × Switch button
• Remote update: Cloud update
• Low battery detection: Yes
• Tamper protection: Yes
• Wireless frequency: 433 MHz
• Transmitter power (EIRP): ≤10 mW
• Communication mechanism: Two-way communication
• Communication distance: Up to 1200 m in open space
• Encryption: AES128
• Frequency hopping: Yes
• Power supply: 100–240 VAC, 50/60 Hz
• Power supply type: Type A
• Standby time: Up to 30 hours
• Low battery threshold: 11,000 mV
• Battery restore threshold: 12,000 mV
• Power consumption:
• 220 VAC quiescent current: 40 mA Irms
• 220 VAC max current @ 2 A load + charge: 315 mA Irms
• Operating temperature: -10°C to +50°C
• Storage temperature: -10°C to +55°C
• Operating humidity: 10%–90% RH
• Storage humidity: 10%–90% RH
• Protection rating: IP30
• Casing material: PC + ABS
• Anti-corrosion level: Basic Protection
• Installation: Wall mount
• Dimensions: 304 × 235 × 90.8 mm
• Net weight: 1.22 kg
• Gross weight: 1.78 kg
• Packaging dimensions: 369 × 140 × 280 mm
• Color: White
• Certification: CE
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