Important: The downloaded music must be in MP3 format. FM cannot be usedThis MP4 has built-in capacity and can also be inserted into a memory card.MP4 connected computers can only support Windows 7 system, not Apple system.Android phones need OTG funct to connect, which is not supported by Apple system.Smartphones with OTG function can support the use of adapters, and can be used by downloading music in MP3 formatMP3 music and video format support tips:Audio format support: MP3 format.Video format: AMV and AVI are supported. [Downloading video requires conversion tools to convert video format].Main features:1.8-inch TFT color screen MP4 player1.1 inch color displayStorage capacity: support up to 128G cardsMaximum output power: 18mW * 2Frequency response range: 20Hz-20KHzSignal-to-noise ratio (dB): 90Total harmonic distortion: less than 0.05%File access function:Battery type: built-in lithium battery (built-in)Screen size: 1.8 inchesTravel time (hours): about 8 hoursStandby time (hours): more than 24 hoursAudio format support: wav/mp3Support recording and TXT e-booksFunctions: listen to music, video, recorder (wav), e-book (txt format)Support TF card player (maximum 128G)3.5mm audio connector, drive-free USB memory stick, EQ mode, multilingualInput: 5.0V, 500MA 600MAH batteryMachine size: 90mmX38.8mmX8.5mmThe built-in capacity model has multiple menu languages:Simplified Chinese, Traditional Chinese, English, Russian, French, Spanish, Portuguese, Japanese, Korean, Indonesian, Dutch, French, Italian, Danish, Hungarian, New Zealand, Norway, Finland, Trkiye, China, etc..