Features: Brand new and high quality It is recommended to attenuate the signal below 0dBm before inputting it to the machine for measurement, for example, a 5W (37dBm) walkie-talkie needs to be connected to a 40dB attenuator before being connected to the machine for measurement. Using the signal generator function, you can simply test the sensitivity of the walkie-talkie. Used to debug NFC, LoRa, GPS, 3/4/5G mobile communication (below 6GHz), WIFI equipment, find equipment, find signals, etc. More functions to be discovered, please refer to the forum discussion with 2000+ people: groups.io/g/tinysa/topics. It is not SDR, but has FM and AM demodulation capabilities (general performance), and can listen to the radio through the built-in headphone jack. Specifications: Material: metal Size: 4inch Nominal Frequency: 100K-5.3GHz Package Includes: 1Set x Spectrum Analyzer note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!