1) fire alarm LPG natural gas coal gas detector gas sensor 2) highly reliable 3) Auto reset 4) built-in siren 5) MOQ 10

1.fire alarm LPG natural gas coal gas leak detector gas sensor 

2. Key features:

   1) Advanced MCU and central processing technology

   2) Seven terminals make it possible to work with auto shut-off solenoid valve (12V) and exhaust   fan (110/220V)

  3) Wired/wireless alarm system

  4) Built-in siren with adjustable sensitivity

  5) Low false and missing alarm

3. pics as following :

fire alarm LPG natural gas coal gas leak detector gas sensor