Andoer DC10-22V AC 10-16V 25W 2 / 20W 2 Bass Audio Speaker HIFI Digital Amplifier Board Supports Formats: MP3 (8-320K Code Rate), WAV (8-48000Hz Sampling Frequency). Cyclical Pattern: Four Modes, starting up default Sequence Circulation. First time, press the remote control button of REP to achieve "Shuffle", short press the button second time to achieve "Song cycle", short press the button third time to achieve "Stop after ended playing the single song", and short press the button fourth time return to Sequence Circulation mode. Operating Mode: Support remote operation (global function), can also connect eternal keyboard plate to achieve manual control. Compatible with Devices: USB flash disk, mini SD (memory card) and the USB Card Reader with MicroSD Card / TF Card. (Note: Not supports DTS surround 5-6 sound channel WAV format)