MP3-connected computers can only support Windows, not Apple. MP3 music and video format support tips: Audio format support: MP3 format. Maximum output power: 18mW x 2 Frequency response range: 20Hz-20KHz. Signal-to-noise ratio (db): 90 Total harmonic distortion: less than 0.05% Screen size: 1.8-inch color screen Playing time (hours): about 7 hours. Standby time (hours): more than 24 hours. Audio format support: wav/mp3 Support listening to music, watching videos, tape recorders (wav) and e-books (txt format). 3.5mm audio jack, driver-free USB memory stick, and many national languages. Input: 5.0V, 500MA 600MAH battery. Note: Don't use YouTube to download. Music documents downloaded by YouTube can't be used. You need to use special conversion software to convert the format. The maximum decoding range of downloaded music format is 16bit, 192kbps, FLAC format cannot be greater than 48khz, and the audio sampling rate is 44100. Download the electronic novel document in TXT format and encode UTF-8. Color: black Material: ABS Package Contents: 1 x earphone 1 x data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.