SPECIFICATIONS:◾ Compatible modules:- Shelly Plus 1- Shelly Plus 1PM- Shelly Plus 2PM- Shelly Plus i4- Shelly Plus i4DC◾ Firmware features:- Temperature reading: supports up to 5 DS18B20 sensors- Humidity and temperature reading: supports one DHT22 sensor- Digital input:· True: -15V to 0.5V· False: 2.5V to 15V- Analog input (voltmeter):· Range: 0 to 10V· Accuracy: < 5%· Notification threshold: 0.1V· Sampling frequency: 1Hz◾ Electrical:- DC power supply voltage: 3.3V (from the Shelly Plus device)- AC power supply voltage: (not supported)- Power consumption: < 0.5W (without sensors)◾ Output circuits:- Max VCC current: 10mA- Max VREF OUT current: 1mA◾ Environmental:- Ambient temperature: -20°C to 40°C- Humidity: 30% to 70% RH- Max altitude: 2000 meters◾ Physical:- Max wire section: 1mm²- Material: Plastic- Color: Black- Size: 37x42x15 ±0.5mm.