... built-in stereo speakerInterface: OTG digital Support Hard disk,digital Camera,Mobile,USB,card reader and can be connected with printer ect ... OTG Accessories: usb cable, headphone, charger and manualUSB: USB2.0HOST: HOST1.1 ... connect with mouse, keyboard, USB diskCharging: small type charging port,DC9V inputEarphone/Video: 3.5mm ...