> Alarm indicator: Green led flash
> Manual test; Auto reset > Detects natural gas, coal gas, LPG > Highly stable semiconductor gas sensor > SMT manufacture technology, high stability > Adopts check malfunction > High capacity relay (0.3A/250V) > RF signal: 433MHz (wireless type) > Execute criterion: GB15322.2-2003 > ABS plastic material > Can work with solenoid valve, the fan (WL-938WL/938DL type)spend $20.96 More And Enjoy Free Shipping!