Adopt high-quality double-panel design with power indicator and TTL signal output indicator. Features DO switch signal (TTL) output and AO analog signal output. TTL output provides high and low logic levels (0.1 V and 5 V), compatible with microcontrollers and relay modules. Analog output voltage varies with gas concentration; fast response and recovery time. Designed for long service life and reliable performance. Electrical specifications: - Input voltage: DC 5 V - Power consumption: 150 mA - DO output: TTL digital signal (0 and 1) - AO output: Analog voltage signal Note: After power-on, allow approximately 20 seconds for preheating before readings stabilize. Slight heating during operation is normal due to the internal heater. Wiring: 1. VCC: Connect to 5 V power supply positive 2. GND: Connect to power supply ground 3. DO: TTL digital output 4. AO: Analog output Color: Green Material: Metal Package includes: 1 x MQ136 Hydrogen Sulfide Sensor Module