DHI-HY-SA21A-W2
Wireless Smoke Alarm (433MHz)
> Operating Voltage: DC 3V
> Battery Life: 3 years
> Communication: 433 MHz
> Compatible: DHI-ARC3000H-W2, DHI-ARC3000H-GW2, DHI-ARC3000H-FW2
> Sensor type: Photoelectric chamber
> Notification: Visual and audible
> Standard: EN 14604:2005, AS 3786:2014