Quantity: 1 - Color: Blue - Material: PCB - Main chip: LM393 - Working voltage: DC 5V - With output status indicator light lower level light on; High level light off - Output open start is higher than the set temperature then closed is lower than the set temperature - The comparator output directly drive the relay can be connected to AC 220V or other devices - Distribution thermal sensor bit to adjust temperature - Sensor interface pin and plus leads can be installed - With 4 x 3mm fixed bolt hole for easy installation - Monitors tank temperature indoor temperature auto temperature etc. - Packing list: - 1 x Module