Feature : Mini USB interface Support MP3 ,WMA Music Modes Step up program Can long recording for 5 hours Could be re-broadcast the five preset sounds Built -in high quality Li-ion battery Work as a removable USB disk , there is no need driver above win98 operation High Speed USB2.0 Interface with effitive download rate up to 300KB/S Unit Size :44.7mm*38.75mm*6.4mm Weight :13G