1.USB flash disk with 1.1/2.0 interface compatible. LCD dispaly 2.Voice record function: long time and high-quality recording with inside microphone 3.Storage capacity: 32MB, 64MB, 128MB, 256MB, 512MB, 1GB and 2GB 4.Music format: compatible work MP3, WMA and other formats 5.Play mode: random, normal, repeat all, repeat one, intro and shuffle all 6.Supports A-B repeat 7.Supports multilingual song name and lyric display 8.Sound effect format: normal, jazz, classic, rock, pop and full bass 9.Seven colors backlight: orange, red, cyan, blue, green, white, purple and auto 10.Line-in recording and direct MP3, WMA encoding 11.FM radio earphone or built-in FM radio receiver (option) 12.Operation system: Windows 98, ME, 2000, XP and 2003 (no driver is required except Windows 98) 13.Earphone output: 5mW + 5mW.Output frequency range: 20Hz to 20kHz 14.Run on 1x AAA cell up to more than 8 hours playback