Specification: Built-in Memory:8GB;  Bluetooth Version:V4.0;  Transmission Distance:10m/33ft;  Voice Record Distance:3.0m/9.8ft;  Screen Type:2.4-inch TFT Screen 240 x 320p;  Music Format:WMA/MP3/APE/FLAC/WAV/DRM/ACELP;  Video Format:AMV/AVI;  Voice Record Format:WAV/MP3;  Picture Format:JPEG/BMP;  E-book Format:TXT;  Input Power:AC 110-240V 50/60Hz;  Output Power:DC 5-5.5V;  Built-in Battery:420mAh 3.7V Poly-lithium Battery 043040;  Music Play Time:About 36 hours through earphone, 8 hours through speaker (depends on music volume);  Bluetooth music play time:9 hours;  Video Play Time:About 8 hours through earphone, 4.5 hours through speaker (depends on music volume);  Voice Record Time:36 hours;  Charging Time:About 2 hours;  Material:Zinc Alloy + Plastic;  Size:109 x 49 x 10mm/4.29 x 1.92 x 0.39inch;  Weight:218g/3.56oz;     Features: Multi-functional Player It is not only a MP3, MP4 player, but a FM radio, voice recorder, E-book reader, picture viewer. Also, it has the function of pedometer, stopwatch, alarm clock and calendar. Plus, you can use BT function to connect it to your BT speaker or BT earphone. It supports 26 languages Support Various Media Format.  It supports music format including WMA, MP3, APE, FLAC, WAV, DRM and ACELP; video format including AMV and AVI; voice record format including WAV and MP3. Also support several picture format and E-book format.  Strong Memory Capacity Built-in 8GB memories, up to 2000 music can be stored, support up to 64 GB expandable TF card. You can save files you like on D11 as a U-disk.  Long Battery Life Built-in 420mAh large capacity battery ensures up to 36 hours music play time and 8 hours video play time through earphone. Just charge for two hours and you can immerse yourself in the world of entertainment.  Delicate & Textured Design Made of high-end zinc alloy and plastic, give you textured feeling, the zinc alloy shell is durable and stable, and matte textured button is non slip and wear resistant.     Package Included: 1 x MP3 Player;  1 x Earphone;  1 x Charging Cable;  1 x English User Manual