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Most MP4 players contain flash memory starting from 2 GB up to 8 GBs. Standard flash memory capacity of a high number of designs is 4 gigabytes. The sizes start from 1.5” up to 7” and are equipped with LCD crystal clear quality LCD screens. The screen resolution of some high tech devices is about 320 x 240 pixels. The audio formats playable are WAV, WMV, MP3, WMA and ASF. Many types are compatible with picture format such as BMP, JPEG and GIF. TXT e-book format and LRC lyric formats are other types of files that can be operative with the MP4 players. There are MP4 players which are compatible with PC operative systems such as Windows 98, SE, ME, 2000, XP, Microsoft Windows Vista, MAC OS10, Linux 2.4.2 etc. The range of MP 4 players does not exclude any type of computer operative systems since every type is compatible with them. Most of them are powered with rechargeable lithium-ion batteries and works for about 3 to 5 hours. The inbuilt microphone and multi language capabilities are other features with modern MP4 players. Almost every type is compatible for audio recording and support NES format. Since MP4 players are very small (about a post card), their portability is extremely feasible. In fact, one major high user-friendly aspect of MP4 players is their lightness in weight. They can be carried while jogging, working out at the gym or with any other high intensity activities. Since they do not contain loose parts, the possibility of losing parts while the user is actively engaged in high intensity activities is nil. Many types come with pre-installed games,in as many as 200 different categories. Using the USB cord that comes with the player, the user can connect it to computers through USB ports. Once connected, its icon appears on the computer screen. In this way, the MP4 files and other pictorials can be downloaded to the MP4 players. Many packages of MP4 players include accessories such as power adapters, earphones, user manuals and USB cables. Even with a smaller 2GB flash memory capacity, 1.8-inch size MP4 player features high workability just like the 4GB high memory capacity, big screens. This type of device is workable with MP1, MP2, MP3 and other type of audio formats. High-speed USB ports, upgrading capability of firmwares, management system of e-documents, and inbuilt microphone with record-ability up to 35 hours are some of the main features with smaller MP4 players. Comparing with their counterpart the MP3 player, one can easily understand the high validity of the extra features of the MP4 players over them.
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