Main chip: LM393, ZYMQ-5 gas sensor
Operating voltage: DC 5 Volt
Indication of the signal output.
Dual signal output (analog output, and TTL level output)
TTL output signal is low. (When low output signal light, and can be connected directly to the microcontroller)
0 ~ 5V analog output voltage, the higher the concentration, the higher the voltage.
Liquefied petroleum gas, natural gas, city gas, better sensitivity.
Has a long life and reliable stability
Fast response and recovery characteristics - See more at: http://www.ewallpk.com/home/1287-mq-5-mq5-methane-gas-sensor-shield-detector-module-for-arduino-mega2560-m27.html#sthash.CWhSlbWf.dpuf