During the further development of the system, user feedback was also taken into account. The updates can be carried out independently and globally through online available updates. From the very beginning, bidirectional transmission has been an integral part of the duplex system. This is used not only for the transmission of telemetry data but also to enhance the actual transmission security between transmitter and receiver. The Duplex EX telemetry system uses an open protocol, ensuring compatibility between a wide range of JETI sensors and third-party products. The display of telemetry data can be done directly on the DS/DC transmitters or on special accessories such as the JETIBOX Profi. JETI Duplex receivers are used in combination with JETI DS/DC transmitters or JETI transmission modules and operate in the 2.4 GHz band. Receivers from the REX SLIM series with 7 servo slots are specifically designed for aircraft with very narrow fuselages. Their compact dimensions are advantageous for pilots who have limited space in their models (e.g., F3J, F5J, etc.).