🧰 Technical specifications
• Model: DHI-HY-SA21A-433
• Type: Wireless Smoke Alarm
• Detection technology: Dual photoelectric smoke sensing chamber
• Collection type: Smoke
• Working principle: Photoelectric
• Sampling period: 60 s
• Alarm types: Smoke alarm, Fault alarm, Low battery alarm
• Alarm mode: Audible and visual alarm
• Alarm volume: 85–90 dB(A) at 3 m
• Silencing function: Yes
• Indicator light: Red and Green LED indicator
• LED indication:
• Standby: Green LED flashes once per minute
• Alarm: Red LED flashes once per second
• Fault: Red LED flashes once per minute
• Power supply: 3 VDC battery
• Battery life: About 3 years
• Monitoring current: ≤15 μA
• Alarm current: ≤35 mA
• Wireless frequency: 433.1 MHz – 434.6 MHz
• Communication distance: Up to 1000 m in open space
• Communication mechanism: Two-way communication
• Encryption: AES128
• Frequency hopping: Yes
• Operating environment: Indoor
• Operating temperature: -10°C to +55°C
• Operating humidity: ≤95% RH (non-condensing)
• Installation: Ceiling mount
• Casing material: ABS
• Color: White
• Dimensions: Ø98 × 43.1 mm
• Weight: 140 g
• Certification: CE
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