Basic operation: ON/OFF button: main power switch, encoder (ROTARY) mode switch, long the ON/OFF button for 3 seconds to turn on or off, after turning on, short the encoder once for volume, short the encoder twice in a row for atmosphere light selection function, short once to exit. ROTARY (encoder): Turn on to adjust the frequency, short the switch key once for volume, and enter the setting interface for shift function. Short the middle button for step switching, long to turn on and EQ. button: bandwidth selection. Short in FM mode: stereo/mono switching Long in FM mode: demodulation bandwidth switching, switching between 6/64/72/84/97/114/133/151/168/184/200/217/236/254/287/287/311kHz/AUTOBW, or and hold the button and use the TUNING knob to select. Short in AM mode: demodulation bandwidth switching, switching between 3/4/6/8kHz. MODE button: tuning mode Short : MAN (manual frequency tuning)/AUTO (automatic search)/ (memory operation) mode switching. Long : open the menu page. AM/MF button: band selection. Short : band switching, switching between LW/MW/SW/OIRT/FM. Long in FM mode: open advanced RDS view/Alternative Frequency view Headphone output: freight chip is used, which is convenient for connecting to the power amplifier, standard 3.5mm audio connector. output, dual op amp design for speakers and headphones, plug in headphones, and the built-in power amplifier is and switched to headphone output. Communication interface: built-in CH340 USB to serial port chip, external communication through TYPE-C interface, support online upgrade<br><br>Frequency range: 65-108MHz Suitable for Russia/Eastern Europe 76-95MHz Suitable for Japan 76-108MHz Suitable for campus broadcasting FM 87-108MHz Suitable for Europe/Oceania/Africa/Asia 87.5-108MHz Suitable for China/USA OIRT default step 30kHz, FM step 50/100/200kHz, default 100kHz Shortwave 1700-27000kHz default step 5kHz 522-1791kHz defaul