Features: This is an RTLSDR blog V4 software defined radio receiver with RTL2832U chip, R828D tuners, 1PPM TCXO, SMA F connector and aluminium case with passive cooling. Tunes from 500 kHz to 1.7 GHz with up to 3.2 MHz (2.4 MHz stable) of bandwidth. Perfect for use as a computer based radio scanner with frees software. Great for many applications including general radio scannings, air traffic control, public safety, ACARS, trunked radio, POCSAG, weather balloons, APRS, NOAA weather satellites, radio astronomy, or as a low cost panadapter with a radio. Comes with a multi-purpose dipoles antenna kit which is perfect for beginners. When used in v-dipoles configuration the antenna works for 137 MHz weather satellites. Use in vertical configuration for terrestrial signals. This model has several improvement over other brands. It uses the improved R828D tuners, has an improved front end with filtering, a 1PPM TCXO, better components, cooling improvement. Most standard RTLSDR dongles can tune down to 24 MHz at the lowest. This model has a built in upconverter, and allows for tunings down to 500 kHz. There is a built in 28.8 MHz low pass filter for optimizing this modes. Specifications: Material:Metal Type:Dongle,Dongle Antenna Kits (optional) Package Includes: 1x or 1Set SMA Software Defined Radio note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.