brand new and high quality Material: Electrical components Color:See pictures The performance of dual IC is stable, and the circuit board is required to communicate with the 24V, but the error is not a problem.The power of the transformer with circuit board is better, the faster the temperature is. Specifications: The heating wire resistance: 2.5-3.5 Sensor resistance: 43-58 Heating wire: 4, 5 feet Sensor: 1, 2 feet Application:only for 1321 Heating core Note: The circuit board can only be equipped with a1321 type heating core, please first confirm your iron handle is what type of heater. Size: See the picture Quantity: 1Pc No retail package Note: Due to the difference between different monitors, the picture may not reflect the actual colorof the item. Thank you!!