TR636: Functions: (main function):Full media stereo; FM/AM radio:FM 87- 108MHz; AM 520-1710KHz;Remote control for remote operation; LCD display showing media information; CD playback/USB playback (random play, sequential play); 3.5mm jack for use with headphones, 1x Retekess TR636 CD radio, 1x AC power cable, 1x Remote control, 1x English manual TR621: Cassette Player, Built-in cassette tape deck with recording function. Top-loading CD, Compatible with CD/CDR/CDRW/MP3/WMA. , AM 530-1600KHz and FM 76-108MHz, which lets you choose from a wide variety of radio, talk and music programming. 3.5mm earphone jack. High-power dual speakers, Dual high-performance drivers and a power bass, which gives your music that extra kick you desire. Equipped with a remote control. You can remotely operate the boombox radio without getting close. Specification: Power Source: AC 110 V~, 60Hz / 6xA Batteries, Tape Speed: 4.76CM/S士3%, Impedance of Speakers: 77MM, 6ohm. Item Dimensions: 10.2x8.6x5.5in, Weight: body 2kg, Package: 1xTR621 Body (without Battery), 1xAC Power Cord, 1x Remote Control (with button Battery),1xEnglish User Manual