• AZDelivery MQ-135 air quality sensor module, compatible with Arduino and Raspberry Pi. • Allows detection of toxic gases such as benzene, alcohol, smoke, and other air pollutants. • Measurement range from 10 to 1000 ppm, suitable for alarm systems, leak detection, and microcontroller projects. • Incorporates a heating element and electrochemical sensor, sensitive to a wide variety of gases for indoor use. • Offers high sensitivity and fast response; requires a few minutes of warm-up for accurate readings. • Provides analog and digital outputs, with potentiometer to adjust the activation threshold. • Resolution: 10~1000ppm; Sensitive resistance: 2KΩ to 20KΩ at 100ppm CO; Accuracy: ≥ 3%; Response time: ≤ 1s; Response time after power-on: ≤ 30s. • Heating current: ≤ 180mA; Heating voltage: 5.0V±0.2V / 1.5±0.1V; Input voltage: 5V; Thermal power approx.: 350mW. • Approximate dimensions: 30mm (length) x 20mm (width). • Includes E-Book with information, practical examples, and installation guides to facilitate sensor use.