The Webasto 9005004B External Temperature Sensor is a genuine Webasto accessory designed for Air Top 2000, Air Top 2000 S, Air Top 2000 ST, and Air Top 2000 STC air heaters. Equipped with a 5-meter (16.4 ft) cable, it allows the heater to monitor the temperature from the main living area instead of the heater's installation location, providing more accurate and consistent cabin temperature control. This is product is Aftermarket