Lightspeed's trade-up program also includes the Zulu.2 and Sierra ANR headsets, which sell for $850 and $600 respectively. All three headsets are compatible with Lightspeed's Flightlink iPad app, which allows you to record and replay ATC communications. This function can be particularly useful when obtaining a lengthy IFR clearance. Rather than taking up airtime asking ATC for clarification, you can simply replay the instructions on the iPad to make sure you got it right. The replay function is also a good learning tool as you can permanently store and replay communications from the flight.