How to Operate the USB Music File PlayerAbout Playable USB Memory Standards• Supported File System: FAT 16/32• Playable Audio Format: MP3• Max.Current: 500mA• Compatibility: USB1.1/2.0 (Maximum transmission speed equivalent to USB 1.1: 12 Mbps)• Correspondence: USB mass storage class (Playing from an external HDD is not supported)Playable MP3 File Standards• Supported standards: MPEG-1MPEG-2MPEG-2.5• Supported sampling frequencies:32,44.1,48(kHz)• Supported bit rate: 8,16,24,32,40,48,56,64,80,96,112,128,160,192,224,256,288,320(kbps)* Supports VBR (64~320kbps).* Does not support free format.• Supported channel modes: monaural, stereo, joint, dualID3 tagsMP3 files have an "ID3 Tag" that allows input of information so that data such as song titles and theartist can be saved.This main unit supports ID3v. 1.0, 1.1, 2.2, 2.3 and 2.4.Format of USB MemoryThe format of the USB Memory to be used must be ISO9660 Level 1 or Level 2.The control items for this standard are as follows:• Maximum directory layers: 8 layers• Maximum characters for file names: Up to 256 characters (the maximum number of charactersobtained by adding the folder name and the file name,including “.” and the 3-letter file extension)• Allowable characters for file names: A~Z, 0~9, _ (underscore)• Maximum number of files in a single memory: 3000