Adopt high-quality double-panel design with indicator and TTL signal output indicator. Features DO switch signal (TTL) output and AO analog signal output. TTL output provides high and low level signals, compatible with microcontroller or relay module. Analog output voltage varies with gas concentration. Fast response and recovery. Long service life with reliable stability. Electrical specifications: Input voltage: DC 5V Current consumption: 150mA DO output: TTL digital signal (0 and 1, 0.1V and 5V) AO output: Analog level signal Note: After powering on the sensor, allow approximately 20 seconds for preheating to ensure stable readings. It is normal for the sensor to generate heat during operation due to the internal heating element. Wiring connections: 1. VCC: Connect to positive power supply (5V) 2. GND: Connect to negative power supply 3. DO: TTL switch signal output 4. AO: Analog signal output Color: Green Material: Metal Package includes: 1 x MQ136 Hydrogen Sulfide Sensor Module Note: Light and display differences may cause slight color variation between the image and actual item. Measurement error is +/- 1-3cm.