Small, light height logger/F5J height recorder with plug in reader/programmer (nice large LCD screen - visible in any light). The cables necessary to connect up the various bits and to a computer are included. The logging results can be seen on the down- loadable software available for free from the manufacturer. The manufacturer is good at updating the unit to the latest trends. This has been reliable for me but I have moved to Jeti and they have their own system. The multi 2 can also be interfaced with a GPS for cross country flying.