SFM Mini Speaker SFM Mini Speaker is a MP3 player that supports USB-Host and SD/MMC memory cards. It can play MP3 music files stored on USB flash disks or SD/MMC memory cards. It makes your USB flash disks not only a work tool but also a music player; it also makes the unused SD/MMC memory cards of your digital camera as a CD. SFM Mini Speaker also comes along with a circuit input interface, turning into a power amplifier by the matching patch cord, and can be used with any portable audio device, e.g. radio etc. SFM Mini Speaker is not only powered by the matching transformer but also battery, in this way, you can even enjoy the sweet music anytime anywhere. MP3 code MPEG 1/2/2.5 Layer3 MP3 sampling frequency 8kHz/11.025kHz/12kHz/16kHz/22.05kHz/24kHz/32kHz/44.1kHz/48kHz MP3 bit frequency 32kbps to320kbps including VBR USB speech USB full speech 12Mbps Files sub area table only support the first sub area the files system of FAT16/FAT32 Files catalogue support 8 grade sub-catalogue Music quantities support 511 ones Batteries 4Byte AAA batteries External power source direct current of6V Output power about2W