JB-S878 conventional smoke detector according to EN standard 

MAIN FEATURES

1. 2 or 4 wire models
2. Dual LEDs for 360° visibility
3. Advanced detection and discrimination algorithms
4. Easy installation and maintenance
5. Sleek low-profile housing design
6. Durable sensor head. No need for replacement
7. SMD circuit board design
8. Satisfactory quality and reliability guaranteed
9. Normally-closed (N/C) -Normally-open(N/O) selectable relay output
10. Five-year limited warranty
11. Dimensions:  Ø100 X 48 mm