Characteristics and Interoperability FM functionality, a built-in high-definition microphone, and long-term, high-quality recording are available. Engage in Thumb Drive Work: File management: use folders to organize files just like on PCs 1.8-inch LCD screen music video player for MP3, MP4, and video Integrated FM Radio Plays MP3 and WMA File Formats Rechargeable lithium battery integrated in Support Micro SD Card Sizes from 128MB to 32GB for MP3 Players Video Support: AMV format; to convert a video to AMV format, download the necessary software. FM functionality, a built-in high-definition microphone, and long-term, high-quality recording are available. Engage in Thumb Drive Work: File management: use folders to organize files just like on PCs Supported Audio Video: Mp4 Display Diameter: 2 inches Yes, external memory Resolution of display: 320 x 240 Inbuilt Speaker: Sure