Remote Combustible Gas Sensors for Scentry III GFRAB Gas Valve Controller Systems Add up to 4 remote gas sensors to your Scentry III GFRAB Propane/Natural Gas Home Gas Detector Automatic Gas Valve Controller not included . This is a case of 6 gas monitor units. Explosive gas detectors interface with the Scentry III GFRAB not included .I mprove home safety and industrial safety when gas is used for cooking and heating. Respect natural gas and propane gas and avoid explosions and fires from gas leaks. Remote Gas Sensor Specifications Case ABS plastic Size 4.6 Weight .5 lbs Color Gray Power Consumption 1.25va Connections Screw Terminal Input Power 9 24 vdc Reset Manual Sensor Type tin dioxide semiconductor Product Specifications Alarm Points for Propane LP 5200 PPM. For Natural Gas/Methane 12,200 PPM Alarm Signal Output Open collector Connects to gas valve and controller via 4 conductor thermostat wire not included Made in USA This item ships from a separate warehouse and may require extra time for delivery.