1PCS Flame sensor module Relay module 2-in-1 flame detection fire alarm #ZJ

1PCS MQ-131 Module Ozone gas detection sensor module air quality detection #YT

1PCS NEW MQ-2~MQ-139 Gas sensor module MQ-2/3/4/5/6/7/8/9 #YT

Waveshare MQ-7 Gas Sensor, MQ-7

1PCS NEW MQ-2 Smoke sensor module Gas detection detection sensor board #YT

1PCS NEW MQ-3-7-8-135 Sensor Gas air detection alarm probe module #YT

1PCS MQ-7 Carbon Monoxide sensor CO gas detection analog level output #YT

1PCS DC3-12V rain module Water leakage alarm sensor Snow droplets detection #YT