MP3-MAS005 Product Description; Codec supported：MP3 (up to 320kbps),WMA (up to 192kbps),WAV Memory; 128MB or 256MB 512MB 1GB File transfer speed: Up to 1.4MB/s Signal to noise ratio: ~90dB THD: ﹤0.1% Frequency response: 20Hz-20,000Hz Earphone output(L+R): 20mW (nominal)/40mW (max) Battery tape/capacity: Built-in Lithium Ion Polymer, 3.7V, 150mAh Maximum input power rating: 5VDC,150mA Battery life: Up to 6 hours of continuous playtime Recharging time: 3 hours (80% charge in 1 hour) Interface: USB 2.0 (backward compatible with USB 1.1)