1 can detect ambient humidity and temperature2 sensor DHT113 humidity measuring range: 20% -95% (range 0 degrees -50 degrees) and humidity measurement error: + - 5%4 temperature measuring range: 0 degrees -50 degrees temperature measurement error: + - 2 degrees4 Operating Voltage 3.3V-5V5 Output Type Digital Output6 has a fixed bolt hole for easy installation7 small plates PCB size: 3.2cm * 1.4cm8 Power indicator (red)9 Each weighs about 8g Two module interface specification (3-wire)1 VCC 3.3V-5V external2 GND External GND3 DO small board switch digital output interface connected to the microcontroller IO port