ITEM NAME:DC 3-5V 10-1000ppm 4 Pin Alcohol Gas Sensor Module Detector MQ-3 Z1O3 DC 3-5V 10-1000ppm 4 Pin Alcohol Gas Sensor Module Detector MQ-3 Z1O3 Product Name : Gas Sensor Module;Model : MQ-3;Type : Analog Detecting Type : Alcohol, Ethanol ;Rated Voltage : DC 3-5V;Detecting Range : 10 to 1000ppm Pin Quantity : 4;Pin Spacing : 1.8mm/ 0.07";Pin Definition :AO-analog Output,DO-Digital Output,GND- Ground,VCC-Voltage To Current Converter Total Size : 35 x 20 x 21mm/ 1.4" x 0.79" x 0.83" (L*W*H);Material : Plastic, Electronic Part Net Weight : 7g; The gas sensor are suitable for detecting Alcohol concentrations in the air. It is able to give alarms when those gas leaks. You can adjust the sensitivity with the potentiometer. Package Contents: 1 x Gas Sensor Module Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.