Coby MP-C351 Portable MP3 Boom Box with 512 MB Flash Memory and SD Card Slot (Discontinued by Manufacturer) Portable MP3 boombox with 512 MB of integrated flash memory and FM tuner Stores up to 8 hours of MP3 files or 16 hours of WMA files; SD/MMC card slot 4 aluminum-cone speakers for out-loud playback; real-time MP3 encoding Built-in microphone for digital voice recording; line-in jack for connecting other devices Runs on 4 C-size batteries; measures 11 x 3.3 x 3.3 inches (W x H x D); 90-day warranty