... , alto,. High sound.3. It can be used with mobile phone, all device with 3.5mm4. Guitar style, can hang in the sitting ... . SD card, MMC card and U disk, support MP3 play. 7. It has three different interface of the mobile phones and MP38. Have USB interface ... , power OFF.2. Status LED: power on, the switch has a green led is lit on the top left, enter TF card reading, reading U-disk ...