1. With signal output indicator light; 2. Dual signal output (analog output and TTL level output); 3. TTL output effective signal is low level (the signal light turns on when output is low level, compatible with microcontroller IO ports); 4. Analog output increases as gas concentration increases; 5. High sensitivity with detection concentration range of 10 PPB to 2 PPM; Size: 32mm x 22mm x 27mm (L x W x H); Main components: LM393 chip, -131 sensor; Operating voltage: DC 5V; Long service life and high stability; Fast response time; Equipped with mounting holes for secure installation; Probe is detachable for easy testing and replacement; Application: Suitable for home and environmental monitoring devices; Material: Plastic and metal; Color: Blue; Package Contents: 1 x Sensor Module Note: Other items not included. Note: Lighting and display differences may cause slight color variation. Measurement error allowance: +/- 1-3 cm.