Model MQ-4 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-4 sensor; Working voltage: DC 3~5V; Detecting range: 300~10000ppm Application Suitable for home / industry gas and methane detection using Packing List 1 x Gas methane sensor module