Pyle Home PMSU1B Bass Expanding Mini Speaker with Built-In USB SD Card Reader (Black) Plays all iPod/iPhone models and other audio devices with 3.5-mm audio jackCustom-tuned vacuum bass design for low frequency response Fits in your Hand / Pocket for ultimate portability - Volume +/- Button, Easy To Adjust Volume - Dimensions:2.1''D x 1.6''W x 2.5''H Built in li-ion rechargeable batteries - Rechargeable battery, which can support MP3 player and charger to other device contains built-in amplifier powered by rechargeable battery - Card Reader: Mini SD/MMC card Support And USB Port Play Music From USB Drivers Or MINI SD/MMC Cards - Full Function Remote Controller Sound beyond size - Slim Design for easy Transport - Color: Black