This set, which includes the Featherweight Dual Battery Charger, a Blue Jay 1s lipo battery, and battery connection wires with a connector, covers three of the six components required to operate the Blue Jay Altimeter. If you bought these components separately, they would cost additional money.

What's Not Included

The Blue Jay altimeter itself,

the E-Matches to eject the parachute,

and the magnet (to toggle the magnetic switch).