... Speaker 2.can use the USB,SD,MMC card with MP3,MP4,Mobile,FM 3.frequency87.5-117MHZ. Plastic mini ... Speaker1.It can use the USB,SD,MMC card with MP3,MP4,Mobile,FM,the product including the Lithium battery, ... Can play SD / MMC card directly* U disk in the MP3 format * do not need switching* with memory automatically read, equipped ... interface and Nokia charging interface. Mini Speaker with FM/MP3/MP4