UMLIFE 9PCS/Lot Gas Detection Sensor Module MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 MQ-135 Sensor Module for Arduino.

Features: 1. With signal output indicator light 2. Size: 32mm X22mm X30mm length * width * height 3. The main chip: LM393, MQx gas sensing probe 4. Working voltage: DC 5V 5. The dual signal output (analog output and TTL output6. The analog output and increased with the increase of concentration,the higher the concentration higher voltage Package Included: MQ2 MQ3 MQ4 MQ5 MQ6 MQ7 MQ8 MQ9 MQ135 each one pcs.