Texas Instruments LM324 Low Power Quad Op-Amp SMD IC Capacitive Touch Sensor Module Module MQ-4 Output Type Both

Module MQ-4 Output Type Both Analog and Digital  IC Chip LM393 Operating Voltage 3V-5V DC  Detecting Range 300ppm to 10000ppm Length x Width x Height 31 x 19 x 21 (mm)

Clear Press the learning button for 5 seconds

and the complete length with UFL connection termination is 12

01nf Package  0805 Quantity  4000 Tolerance  5%

The signal of the wireless RF switch can pass through walls

Texas Instruments LM324 Low Power Quad Op-Amp SMD IC Capacitive Touch Sensor Module Module MQ-4 Output Type BothThe LM324 IC consists of four separate, high gain, internally frequency adjusted operational amplifiers designed to operate across a wide voltage range from a single power source. It is also feasible to run on split power supplies, and the low power supply current drain is unaffected by the size of the power supply voltage. The default input offset voltage is very low which is of magnitude 2mV. The operating junction temperature ranges from 0C to 70C