1) Memory: built-in 128MB, 256MB, 512MB, 1G Flash memory 2) With USB Flash disk 3) 87.5 - 108MHz FM radio 4) Digital voice recording: a) 128MB: 8hrs b) 256MB: 16hrs c) 512MB: 32hrs d) 1G: 64hrs 5) Play time: 8hrs 6) Recording time: 500min, 128MB 7) Recording format: PCM, MS ADPCM, IM ADPCM 8) Backlight: 7 colors 9) Music format: MP3, WMA, WAV 10) Playback EQ: jazz, classic, rock, pop, normal 11) Power supply: Li-ion rechargeable battery 12) Data retention: 10 years 13) Power output: 5mW + 5mW (32Ω) 14) Frequency response: 20Hz - 20kHz 15) SNR analog output: ≥90dB 16) Interface: USB2.0 17) Weight: 30g 18) Dimensions (L x W x H): 59 x 39 x 11.5mm