FS Halo headset and Garmin GDL39
FS Quiet Technologies Halo headset. New, used several times for trial fit of a helmet for test flights. Helmet Project failed. Headset still near new. $200 shipped UPS Ground in USA.
FS Garmin GDL 39 ADS-B and GPS receiver Used about ten hours and then replaced. GDL 39 with base mount, 12v charge cable and manual. $300 Shipped UPS ground in USA.
As Bill Stout (designer of the Ford Trimotor) used to say, “Simplicate and add Lightness”