... MP3 player with built in speaker 2.Support usb/sd/mmc 3.In battery and external battery slot 4.FM,Clock,Alarm,LED display SU-10 mp3 player ... phone,MP3,MP4,PC,TV,DVD,IPOD,IPONE by connecting 3.5mm stereo audio cable between mini speaker socket "Line in" and other device, , 3. ... Response:150~18KHZ 5.Impedance:4Ω6.3.5mm Stereo Audio Jack/line in jack7.Built-in 500MAH rechargeable Li-ion battery8.External ...