Portable Bluetooth speaker program features: Bluetooth Audio: Bluetooth 3.0 + EDR, maximum receiving distance of 10 meters. Bluetooth phone: clear voice, no echo. MP3 playback: direct broadcast TF card storing MP3 files. FM radio: FM digital stereo radio, the radio memory play. Audio input: Stereo audio input interface, easy to connect computers, digital music players, cell phones and other audio devices. Breakpoint memory: tracks the volume automatically remember the last exit. Built-in Battery: Built-in rechargeable lithium battery, environmental protection, energy saving, practical. USB card reader: Connect computers, TF card, copy or delete songs. USB sound card: Connect the computer, play computer audio files, you can control the computer down song, volume.