Function- Stand-alone operation to convert old-fashioned cassette music to MP3 format without using a computer.- Supports external audio - eg vintage record players - to record as MP3 files.- Plug and play.- Playback function, you can directly view the recorded music files with the device.- It can also be used as a personal cassette player, and it can also be used as an ordinary MP3 player by inserting a TF card.Specifications- Interface: USB/2.0 standard- Recording format: MP3- Power supply: 2 AA dry batteries（not incuded） or USB interface power supply- Audio channel: left and right channel stereo- Audio Bitrate: 128Kbps- Dimensions: 160 * 94 * 35 mm- Weight: 145 gramsPackage Contents- cassette to MP3 to U disk*1- earphone*1- USB cable*1- manual*1NoticeDue to lighting and display reasons, there will be color difference between the real object and the photo, please refer to the real objectThe above data is for reference only, the size is manual measurement, there may be 1-3cm error, please refer to the actual product, thank you.