1. This is a for V4 receiver with RTL2832U ADC chip, R828D tuner, 1PPM TCXO, SMA connector and aluminum housing with passive cooling 2. Tuning range is 500kHz to 1.7 GHz, bandwidth is up to 3.2 MHz (stable 2.4 MHz). Ideal for use as a computer-based radio scanner with free software such as SDR#, HDSDR, SDR-Radio, GQRX or SDR Touch on Android. Works with computers like , 0SX, Linux, Android, and for 3. Ideal for many applications including radio scanning, air traffic control, public safety, ADS-B aircraft radar cluster radios, P25/MotoTRB0 digital voice, POCSAG, weather balloons, APRS marine AIS, ACARS, NOAA APT/Meteor M2 weather satellites, radio astronomy, , or as a low-cost panadapter with amateur radio 4. This model has several improvements over other . It uses an improved R828D tuner with an improved front end with filtering, 1PPM TCXO, better components, a redesigned low noise PCB, cooling improvements, additional ESD protection, and SMA F connectors. 5. It also has a software activatable bias tee for powering the LNA and active antenna. It also has HF reception capabilities. Most standard RTL-SDR dongles can tune down to 24 MHz minimum. This model has a built-in upconverter and allows tuning up to 500kHz. A built-in 28.8MHz low-pass filter is used to optimize this mode. The product appearance and printed words depending on the batch, but this does not affect use. Color:Black Material:Metal Package Contents: 1 * Radio Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.