Roland All-In-One Mobile Recorder PAK including the Roland SD-2u SD Card Recorder with Built-In Stereo Microphone and Speaker System, Earbuds, and SD Memory Card. Roland SD2u SD Recorder, Record Directly to SD/SDHC Cards, Built-In Stereo Mics, Built-In Speaker System, 2x Combo XLR/TRS Mic Inputs with 48V, 1x 1/8 Mic Input, Stereo RCA Line Inputs, Playback Speed and Key Adjustment, Built-In Tuner and Metronome, Includes Wireless Remote, Battery or AC Powered, The SD2u SD Recorder from Roland can be used to record audio directly to SD and SDHC cards. It features built-in stereo microphones as well as two combination XLR/TRS microphone inputs with 48V phantom power for miking flexibility. It also accepts audio from a 1/8 plug in power mic input as well as stereo RCA line inputs. The SD2u is also designed to be used as a training tool and features a built-in tuner and metronome as well as playback speed and key adjustment. These features allow you to slow a song down to learn a difficult passage or adjust its key to suit your voice. Roland's Center Focus feature allows you to isolate a track's mono sounds such as vocals to make them easier to hear and learn. The included wireless remote allows you to start and stop recording from a distance. The SD2u can be powered by six AA batteries or the included AC adapter.