... player with dry battery,card slot mp3,support SD,MMC,support 1GB-16GB,USB2.0 card reader mp3 with dry battery(SO-C022)1.standard USB port ... , high-speed 2.0 transmission speed2.WMAmusic format:MPEG1/2/2.5 LAYER3 format's MP33.card ... function7.colors:white,black,pink8.SNR sinal Noise Ratio:SNR88db9.battery:common AAA dry battery card reader mp3 with dry battery(SO-C022)