Specifications Type Value Physical PCB size (LxWxH): 40x21x7 mm / 1.57x0.83x0.28 in Weight: 8.5 g / 0.3 oz (with the cables) Environmental Ambient temperature: -20 °C to 40 °C / -5 °F to 105 °F Humidity 30 % to 70 % RH Electrical Power supply: 8-24 VAC 9-28 VDC 5 VDC (stabilized, via +5 VDC and GND) Power consumption: < 1 W Input circuits ratings Digital inputs resistance: 50 k? Digital inputs triggering voltage: 1.5 V (active low level) Output circuits ratings Max switching voltage: 30 V Max switching current: 300 mA Sensors, meters Voltmeter: 0-15 VDC / 0-30 VDC (Two-range) Voltmeter accuracy: Pulse counter input triggering voltage: 1.5 V (active low level) Pulse counter max frequency: 1 kHz External sensors supported: Single DHT22 or up to five DS18B20 Radio RF band: 2400 - 2495 MHz Max. RF power: <20 dBm Wi-Fi protocol: 802.11 b/g/n Wi-Fi Range: Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions) Bluetooth Protocol: 4.2 Bluetooth Range: Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (Depends on local conditions) MCU CPU: ESP32-U4WDH Flash: 4 MB Firmware capabilities Schedules: 20 Webhooks (URL actions): 20 with 5 URLs per hook Scripting: Yes MQTT: Yes CoAP: No