Software Defined Radio, SDR is a type of radio broadcast Broadcast communication technology, which is based on software-defined wireless communication protocols rather than through hard-wiring. Frequency Bandwidth, air interface protocols and functionality can be upgraded through software downloads and updates without a complete update Replace hardware. 100KHz-1.7GHz full-band RTL-SDR receiver, which can be connected to computers and Zhuo mobile phones and other devices use SDR software to receive electromagnetic waves from 100KHz to 1.7GHz and support AM, FM (NFM, WFM), CW, DSB, LSB, and USB demodulation. Can listen to medium wave, short wave, FM radio, short wave single sideband communication, walkie-talkie calls, aviation band, etc. (Added mute detection function, CTCSS.DCS, frequency scanner, digital signal, automatic scanning, etc.). Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:Black Material:Metal Package Contents: 1 * 100KHz-1.7GHz RTL-SDR Receiver Upconverter kit 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.