[Built-in Calibration Signal Generator] When not doing spectrum analyzer, it can be used as signal generator with two frequency outputs,MF/HF/VHF sinus output for 0.1MHZ-350MHz and UHF square wave output for 240MHz-960MHz. It is used for automatic self test and low input calibration. [Input Frequency Range] This Spectrum Analyzer with two inputs ,high quality MF / HF / VHF Input for 0.1MHZ-350MHZ and lesser quality UHF Input for 240MHZ- 960MHz. [PC Control] This spectrum analyzer can be connected to PC through USB, and realizes the serial over USB (CDC) protocol, which can call a number of commands. After connecting the PC, the driver will be downloaded automatically. [ESD Protection Function] The latest version 3.1, new ESD protection function, installed diodes,so that it has more sensitive response performance, efficient anti-static level, better quality, longer service life. [Built-in battery] Built-in 650mA battery, rechargeable and portable for at least 2 hours. Different batches may result in different product appearances, printed text, and colors, which do not affect usage Colour:Black Material:plastic Size:Housing:58.7mmx91.3mmx17.1mm(excluding protrusions) Package Contents: 1 * 2.8inch Spectrum analyzer 2 * Sma-sma rg174 rf cabe 1 * USB Type-C Data Cable 1 * Hand rope 1 * SMA female to female connector 1 * SMA telescopic antenna 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.