The Helios KWL-SL 4/20 is a 20-meter ribbon cable fitted with RJ10 plugs on both ends, designed for seamless integration of the KWL-BEC comfort controller, CO2 sensors, mixed gas (VOC) sensors, humidity sensors, KNX/EIB modules, or extension modules. It offers a dependable connection for precise control and monitoring within Helios ventilation systems, ensuring consistent performance and flexibility in system configuration.