Model MQ-7 Quantity 1 Color Black Material PCB Features 1. Signal output indicator; 2. Dual Signals output (analog output and TTL output); 3. TTL output signal is low level allows to connect with SCM directly; 4. Analog output 0~5V voltage; 5. High sensitivity; 6. Long working lifetime and stable performance; 7. Quick response and recovery Specification Chipset: LM393 + MQ-7 sensor; Working voltage: DC 3~5V; Detecting range: 10~1000ppm Application Suitable for home / industry CO carbon monoxide detection using Packing List 1 x CO carbon monoxide sensor module