Please note, this is the new V4 unit and not all software is compatible with it yet!
Compatibility with most programs on Windows and Linux is now OK, but MacOS and Android is still catching up.
Please consult the V4 users guide on our website for more information (sorry eBay does not allow links).
An RTL SDR is great for many applications including general radio scanning, air traffic control, public safety radio, ADSB, AIS, ACARS, VDL2, trunked radio, P25/DMR digital voice, TETRA, POCSAG, weather balloons, APRS, NOAA APT or METEOR M2 weather satellites, Outernet, Inmarsat, Iridium, GSM, Milsatcom, radio astronomy, meteor scatter monitoring, DAB, or for use as a low cost panadapter with a traditional ham radio.
Just search our RTL-SDR Blog website (sorry we cannot link to it here due to eBay rules) for your application of interest to see some ideas.