The Main Features: Frequency Range: 20Hz ~ 20KHz Headphone Output: (L) 18 mW + (R)18 mW (16 Ohm) max. Volume (L) 12 mW + (R)12 mW (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 ,Orange & white Recorder Watch for time show