The Main Features: Frequency Range :20Hz~20KHz Headphone output:(L)18 mW+(R)18 mW(16 Ohm) max.Volume (L) 12mW+(R)12mW(32 Ohm)max,Volume S/N Ratio:90dB (MP3) File Type:MPEG 1/2/2.5 Layer 3,WMA,ASF Bit Rate:8Kbps~320Kbps Encoding:11.025KHz~44.1KHz,8Kbps~320Kbps Voice Recording:Approx.36:00 hrs Approx. 72:00 hrs Approx. 144:00 hrs Approx. 288:00 hrs (8kbps,128MB) (8kbps,256MB) (8kbps,512MB) (8kbps,1GB) Max. Playtime: Approx. 10 hours(128Kbps,MP3,Volume:20,EQ Normal,) USB:USB 2.0(Full Speed) Battery:Rechargeable Battery Operation Temperature:0℃~40℃ Capacity:From 128M to 2 G are available Color:blue,black & white Recorder Watch for time show