The store manager recommends fire certification (natural gas gas gas gas liquefied gas) fire certification round type (natural gas gas gas liquefied gas) Wifi alarm (natural gas gas gas liquefied gas) (APP remote notification) basic alarm (to the price of 22) screen display voice fire certification (natural gas gas gas gas liquefied gas) fire certification (natural gas gas gas liquefied gas) carbon monoxide alarm (fire model + linkage model) gas alarm + through pipeline solenoid valve (fire section + linkage model) gas alarm + cylinder gas solenoid valve single mouth (Fire section + linkage model) Gas alarm + double-headed pointed solenoid valve (fire type + linkage model) Gas alarm + through pipe manipulator (fire version + linkage model) Gas alarm + cylinder gas manipulator (fire version + linkage model) Control solenoid valve host (excluding solenoid valve) (fire version + linkage model) Control manipulator host (excluding manipulator) (solenoid valve