Watch mp3 player Memory: 64, 128, 256mb, 1, and 2gb flash memory Supported formats: mp3 (mpeg1/2, layer 3), ventricle, and u-disk format Interface: headphones, usb charging shared round four pin interface Battery: lithium-ion battery (120mah/37v) Audio recording: wav format Bit rate: 32~256kbps Output rate range: 20hz-20khz Output power: 8+8mw S/n ratio: í²90db Signal to noise ratio Platform: platform 8.6 or above windows 98, me, nt, 2000, xp, and mac Usb transfer rate: usb 2.0 Radio frequencies: 87.5 (76) to 108mhz Temperature: -10 to 50c Sensitivity: 40db/mv