This little unit packs a powerful sound. Like the boomboxes of the 80s and 90s, the Mini Boombox can take a variety of input sources for music and play them back through its powerful built in speakers. The MP3 Boombox plays back MP3 and WMA files from SD Cards, MicroSD Cards, or USB Flash Drives. Or you can use it as a portable speaker and hook it up to the headphone port of your phone, MP3 player or laptop. It also has a built-in FM Radio and Karaoke function, making this a versatile device. It's durable aluminum housing and highly portable, lightweight and pocketable size make it perfect for taking it wherever you go.