... System 2. 0-10V or 2-10V Output Control 3. 3-fan Speed or no fan speed 4. CE approved. Digital Room Thermostat 1 ... resist the interference strongly5Reliable output by relays6RS-485, Modbus(optional)2.Technical Data Power Supply 24Vac , 110 Vac, 220Vac+/-10%, 50 ... Humidity 95%RHShell ABS +PC fire- resistant plastic 3. Pictures. Digital Room Thermostat