Description: Rtl-Sdr is a very cheap hat can be used as a computer based radio scanner for receiving live radio signals in your area (no internet required). Depending on the particular model it could receive frequencies from 500 kHz up to 1.75 GHz. Most software for the Rtl-Sdr is also community developed, and provided free of charge. Note that Rtl-Sdr cannot transmit. The origins of Rtl-Sdr stem from mass produced DVB-T TV tuner dongles that were based on the RTL2832U chipset. With the combined efforts of Antti Palosaari, Eric Fry and Osmocom (in particular Steve Markgraf) it was found that the raw I/Q data on the RTL2832U chipset could be accessed directly, which allowed the DVB-T TV tuner to be converted into a wideband software defined radio via a custom software driver developed by Steve Markgraf. If you've ever enjoyed the Rtl-Sdr project. Over the years since its discovery Rtl-Sdr has become extremely popular and has democratized access to the radio spectrum. Now anyone including hobbyists on a budget can access the radio spectrum. It's worth noting that this sort of SDR capability would have cost hundreds or even thousands of dollars just a few years ago. The Rtl-Sdr is also sometimes referred to as RTL2832U, DVB-T SDR, DVB-T dongle, RTL dongle, or the "cheap software defined radio". Specifications: Material:Metal Size:Approx.7x2.8x1.4cm/2.76x1.10x0.55in Frequency Range:500KHz 1766 MHz Sampling Rate: Max 3.2Msps (2.56Msps stable value) AD Sampling Bits: 8-bit Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1x Rtl-Sdr Defined Radio