AGPtek&reg; Portable Ezcap230 Cassette Tape To MP3 Through USB Disc USB Flash Drive MP3 Converter Adapter Note: the flash drive should be FAT format or it won't work. Converter format: MP3. Power supply: 2*AA Battery, or by 5V DC adapter Working time: 1 hour with 2*AA battery Audio channel: Stereo L/R. Bit Rate: 128Kbps Dimensions: 16*9.4*3.5cm. Weight: 145g (without batteries) Note: if you have any questions about the item, please kindly contact our customer service for help, thanks!