Hitec 55830 Full Telemetry Pack 2.4GHz Hitec 2.4GHz Full Telemetry System Pack. Compatible with Optima 7 and 9 receivers, Spectra 2.4 module and Aurora 9 transmitter. Full telemetry system can transmit information to the Spectra module for display on LCD of the Aurora 9 and/or computer monitor (HPP-22 software is required). RequiresInstallation into airplane, and setting up according to instructions