Support 50ohm mode (can be switched on the screen, and there is an indicator light) Built-in band-pass filter circuit filtering, shielding cover to shield interference Support CW decoding function Equipped with a 3-inch external magnetic full-range stereo speaker, the sound quality is better and there is no broken sound. Use headphones to listen to stereo programs within the FM broadcast range. The headphone cable acts as an FM antenna. Automatic switching of antenna inputs. Screen brightness can be adjusted or turned off completely to add more autonomy and reduce distractions. This is the latest genuine-firmware version 4.17. It is an exclusive customized version in cooperation with the Russian author. It supports the official website upgrade. The new version of ATS25-AMP officially replaces the old version of ATS25Max. Version 4.17 supports all the functions of the old version and adds functions that the old version does not have. New features in version 4.17: 1. The machine carries the latest genuine-firmware and supports subsequent upgrades. 2. Added personalized interface 3. Support LNA function (can be turned on or off on the screen, and there is an indicator light) 4. Support high-impedance HI-Z mode (can be switched on the screen, and there is an indicator light) Colour:Black Material:Aluminum alloy Package Contents: 1 * Host 1 * wifi antenna 1 * telescopic antenna 1 * touch pen 1 * TYPE-C charging data cable 1 * machine corner pad 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.