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Operate Voltage: DC 3~5.5V Temperature Range: -40 ℃ ~ 80 ℃, Humidity Range: 0~100%RH Main Chip: AOSONG AM2302 High Sensitive Temperature Humidity Sensor. DHT22 digital temperature and humidity sensor is a calibrated digital signal output temperature and humidity combined sensor, which application-specific modules capture technology and digital temperature and humidity sensor technology to ensure that products with high reliability and excellent long-term stability.No pull up resistor needed. Just plug right in to Arduino or ESP8266.