BD10 Mini Mp3 Music Player product : BD10Interface: USBSize: About 80mm*25mm*10mmColor: BlackHeadphone interface: 3.5mmCharging time : 2 Hour AlmostMusic Playing time (hours): about 3 - 3:30 hoursadditional function: loudspeaker functionBattery type: 300mah lithium BatterySupport TF memory card..