Shell size: 85 * 32MMFunction introduction: support Bluetooth function / with amplifier 2 * 3W / double decoding MP3, WMA, WAV format music / read USB disk / read TF card / radio FM / external audio input LINE IN (AUX) / infrared remote control / power off memory / Power supply 5VFirst, the main function1. Music format: MP3 / WMA / WAV / FLAC / APE lossless format music2, AC5322B Bluetooth version is version 5.03, 2 * 3W, connect 2 3W speakers4, support TF card, support USB interface (U disk);5, power failure memory function;6, support 5-10 meters distance infrared remote control operation;7, support external audio input LINE IN (AUX);8, support radio FM, receiving frequency band (87.5MHZ-108.0MHZ);9, button: four buttons multi-directional control, the previous song / play pause / next song / MODE;10, support MP3 / USB / TF / LINE IN / FM / BLUETOOTH / DC 5V11, on the structure: panel size: 85 * 32 MM, the depth of the board is 33 MMSecond, the button operation details1. VOL-button (previous song/volume reduction): In MP3 state, VOL-short press is the previous song, long press is for volume reduction; in FM state, short press to adjust one station number; in Bluetooth Short press under the function is the last song of Bluetooth, long press to decrease the volume.2. AUTO button (play/pause): In the MP3 state, AUTO is short pressed to play/pause; in FM state, short press is play/pause, long press is for automatic receiving and saving; in Bluetooth function, short press to play /time out.3, VOL + button (the next song / volume increase): In the MP3 state, VOL + short press for the next song, long press for the volume to increase; short press in the FM state to adjust a station number; under the Bluetooth function Short press for the next song of Bluetooth, long press for the volume to decrease.4. MODE button: switch between USB/SD/FM/AUX/Bluetooth function.