USB SD/MMC MP3 Player w/Earbuds (Black) USB SD/MMC MP3 Player w/Earbuds General Features: Black color scheme Portable, lightweight design Interface: USB 1.1 Supports SD/MMC cards up to 2 GB Supports MP3, VBR MP3, WMA music formats No internal memory SNR: 90 dB Frequency Response: (-3dB) : 20 to 20 KHz Headphone in jack Operates on one "AAA" battery Earphone out: 10mW per channel Dimensions: 2.09 x 2.09 x 0.59-inches (H x W x D, approximate)