his is an receiver with RTL2832U chip, 1PPM TCXO, F connector, R820T2 tuner and case with passive cooling.Tunes from 500 kHz to 1.7 GHz with up to 3.2 MHz (2.4 MHz stable) of instantaneous bandwidth. (HF mode works in direct sampling mode).Perfect for as a computer based radio scanner with free software like for SDR , HDSDR, SDR-Radio, Linrad, GQRX or SDR Press on Android. Works on Windows, OSX, Linux, Android and embedded Linux computers like the for .Great for many applications including general radio scanning, control, public safety radio,ADS-B aircraft radar, boat radar, ACARS, trunked radio, P25/MotoTRBO digital voice, POCSAG, weather balloons, APRS, NOAA weather satellites, Meteor M2 satellites, radio astronomy, meteor scatter monitoring, DAB, or for as a low cost panadapter with a ham radio.It uses the improved R820T2 tuner, comes with a 1PPM TCXO (no drift and tuning with a 2 PPM initial offset and 1 PPM temperature drift), improved component tolerances, redesigned lower noise PCB, cooling improvements, extra ESD protection and an F connector. It also comes with a software activatable bias-tee circuit for powering external devices such as LNA's and antennas.Material:metalcolour:SilverPackage Contents:1 * Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.