SainSmart MG811 Gas Sensor Module for Arduino
<p><b style="color: #D84600">Specifications:</b><br> <br> * Size:32mm X22mm X27mm (LxWxH)<br> * Work voltage:DC6V<br> <br> <b style="color: #D84600">Features:</b><br> <br> * Instructions with the signal output<br> * Analog + TTL output<br> * TTL output signal is low effective<br> * Analog output 30~50mV, high sensitivity and good selectivity<br> * Long life span and reliable long-term stability <br> * Sensor removable design is convenient for testing. <br>  </p>