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I am thinking about buying a mp4 player off of ebay and one is from China. It says it supports English Language but i dont know if these headphones and mp3 recordings would work on in. These are the requirements/what it comes with:
MP4/MP5
Video Formats: RM/ RMVB (720 x 576 maximum), AVI (800 x 480 maximum), WMV, DIVX, XVID, ASF, MP4, 3GP, MOV, MPG

Directly Plays Flash Video Formats:
(no conversion needed), SWF, FLV (Compatible with Youtube)
Built-in High Speed Flash Memory.
260,000 TFT True Color Display (LCD size: 3.0 inch).
Built-in T-Flash/Micros Card Slot
Built-in game.
Built-in high quality speaker.
MP3
Support MP3, WMA, ASF, WAV, ACT Music Formats.
Support ID3: The songs’ titles and lyrics can be shown on screen. (Software Included).
7 Playing Modes: Normal, Repeat One, Folder, Repeat Folder, Repeat All, Random, Intro.
7 presets EQ for your music: Normal, Rock, Jazz, Classic, Soft, Pop, DBB.

Support 16 Languages:
English, Simple Chinese, Trad Chinese, Japanese, Korean, French, German, Italian, Dutch, Portuguese, Spanish, Swedish, Czech, Polish, Russian, and Turkish.
Inter-changeable animated startup screens.
Icon display function: direct icon display, accompanied with icon/ text.

Fm Radio:
Built-In FM Radio: FM stereo radio.
Support stereo sound radios.

FM Frequency Range: 87-108MHz.
Powerful automatic channel search function.
Powerful FM recording function.

E-Book Function:
Support txt Format files.
Phone book support.

Voice Recording:
High Quality Voice Digital Recording, 3 Recording Mode: Fine REC, Long REC, Long VOX
Up to 64 hours of high quality WAV format voice recording and up to 288 hours of ACT format voice recording, Recorded Messages can be saved in 9 Folders & 99 Files.
A-B repeater.
Built-in Microphone.
Built-in Speaker.

Picture Viewer:
Built-in Picture Viewer, support JPEG format pictures or JPEG photos downloaded from internet.

USB Storage:
Act as USB Flash Drive (Can store other data file), USB 2.0 high speed transferring, Plug & Play in Windows (no driver required) except Windows 98 or earlier.

Others:
Use rechargeable Li-ion Battery .
Output Frequency: 20 Hz to 20 KHz, MP3 Bit Rate: 8kbps-320kbps.
Fast Forward, Reverse, Skip and Back Track. Sleep mode, auto Power-Off, Power-Saving mode available.
Size:90 x50 x13mm
Weight:60.5gr
Audio Connector:, 3.5 mm headphone jack

Any player will work in the US. Unless it’s a phone, then there might be some problems.

Just make sure you can connect it to your computer (USB port) and you’ll be all set.