This is an RTL-SDR software defined radio receiver with RTL2832U ADC chip, 1PPM TCXO, SMA 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 use as a computer based radio scanner with free software like SDR#, HDSDR, SDR-Radio, Linrad, GQRX or SDR Press on Android. Works on Windows, OSX, Linux, Android and embedded Linux computers like the Raspberry Pi. Great for many applications including general radio scanning, air traffic control, public safety radio,ADS-B aircraft radar, AIS boat radar, ACARS, trunked radio, P25/MotoTRBO digital voice, POCSAG, weather balloons, APRS, NOAA APT weather satellites, Meteor M2 satellites, radio astronomy, meteor scatter monitoring, DAB, or for use as a low cost panadapter with a traditional ham radio. This model has several improvements over other brands. It uses the improved R820T2 tuner, comes with a 1PPM TCXO (no drift and accurate 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 SMA F connector. It also comes with a software activatable bias-tee circuit for powering external devices such as LNA's and active antennas. Quantity:2Pc colour:Silver Material:metal size:8.8x2.3x1.5cm Package Contents: 2 x Software Defined Radio