Fangrui Product Details Function Description: 1. Supply Voltage: Dc6-24v (dc 9v 12v 15v 24v) 2. Working Current: 8-13ma (related To The Number Of External Ds18b20) 3. Modbus Rtu Command Supports 03 06 Function Code 4. By Modifying The 485 Address, Up To 247 Modules Can Be Cascaded For Use (please Use R485 Repeater For More Than 16 Modules) If Using Ds18b20 Temperature And Humidity Sensor, Up To 8 Ds18b20 Temperature Sensors Can Be Connected At The Same Time(ds18b20 Sensor Not Included) Temperature Measurable Range: -55c To +125c (-67f To +257f). Accuracy Of +-0.5c For Temperatures Within -10c To 85c. Dimensions: 70 X 46 X 18mm Weight: 40 Grams Typical Application: Thermostatic Controls Paperless Recorder Industrial Systems Consumer Products Thermometers Thermally Sensitive Systems Indoor And Outdoor Temperature Measurement Temperature In Vegetable Garden Weather Forecasting, And Monitoring Temperature In Computer Room Warehouse Temperature Color: White + Blue Material: Pcb Board + Electronic Accessories Package C