The term 'BOOM BOX BUTTON' refers to the various buttons found on a boom box, which is a portable stereo system. The three crossword solutions for this term are REC (3 letters), EJECT (5 letters), and PRESET (6 letters). REC stands for 'RECORD, ' which allows users to RECORD audio from other sources. EJECT is used to remove a cassette or CD from the boom box. PRESET is used to store radio stations so that users can quickly access them. Finally, AMFM stands for 'amplitude modulation/frequency modulation, ' which is a type of radio broadcasting.