The Dahua HY-SA21A-W2(868) wireless smoke detector is an advanced fire detection device, designed to provide optimal protection against fire hazards. It utilizes photoelectric technology, which detects fires by identifying smoke particles, recognized as one of the most reliable and precise fire detection methods.
Technical specifications of the Dahua HY-SA21A-W2(868) smoke detector:
- Sensor type: Photoelectric
- Noise level: 85-90 dB
- Wireless coverage distance: 1000 m
- Frequency: 868 MHz
- Two-way communication: Yes
- LED indicator: Built-in (red/green)
- Battery life: 3 years
- Battery type: 3V CR123A
- Operating temperature: From -10°C to +55°C
- Dimensions: ⌀ 98 × 43 mm
- Weight: 140 g
With a sound level between 85 and 90 dB and a wireless coverage of up to 1000 meters, it allows for remote monitoring and control.
Operating at a frequency of 868 MHz, the detector features two-way communication, allowing the user to receive reports and notifications in case of smoke or other issues. It has a built-in LED indicator that displays its status (red/green), ensuring easy visibility of its operation. Powered by 3V CR123A batteries, the detector has a battery life of up to 3 years, making it ideal for use in spaces where regular access for battery changes is difficult.
The compact dimensions of 98 x 43 mm and the weight of 140 g make this detector easy to install and integrate into any space. It operates optimally at temperatures between -10°C and 55°C.
Cable extension adapter connector BNC Female to BNC Female

![Smoke detector, wireless, 868 MHz, 85 dB alarm, Dahua, HY-SA21A-W2(868) [140680]](https://rovision.eu/wp-content/uploads/2026/07/132319_65116655ba3730251-sm2thumb.jpg)




