The wireless online smoke alarm can be included in the same system by a LEARN button. When one of the detectors alarms, it emits the high frequency digital signal(433.92MHz), the others receive the same signal and will alarm together
To remind users to take measures.

Specifications:
1) Power source: One 9V battery, three 1.5VAA
2) Quiescent current: 80uA
3) Temperature: -10º C ~ +40º C
4) Frequency: 433.92MHz
5) Alarm decibel: ¡Ý85dB/3m
6) Size: (diameter) 128x 50mm.