AGPTEK U3 USB Stick Mp3 Player, 8GB Music Player Supports Replaceable AAA Battery, Recording, FM Radio, Expandable Up to 128GB, Black

Review for the AGPTEK U3. Under the batter cover though a small opening, you can see the computer chip that is used in this device, an Actions Semiconductor ATJ331X from 2010. I was able to find the datasheet online. Datasheet mentions is supports WMA and other digital audio standards. I tested a plethora of formats but only MP3, WMA, and WAV files play. It can play CBR and VBR made with the LAME encoder, haven't yet found an mp3 which cannot. Assumes WAV files are voice recordings, as it displays the voice record symbol on the screen, not that it effects the sound in anyway. You could upload music as WAV files if you really wanted to. The screen shows the bit rate of the file being played. CD rips to WAV display as WAV 999 on the screen. The bit rate is actually 1411 but the display can only show three digits. If you are playing a variable bit rate file, it will update and change the displayed bit rate several times a second. The slow LCD display has ghosting issues, so the bit rate can be somewhat hard to read for VBR files. Still, that's a neat feature.Has a variable speed playback setting. Allowing you to playback slower or faster than normal. The audio seems to be monaural or lower quality in some way when the speed is set to anything other than normal.The display shows a small frequency band amplitude visualization, and it seems to actually update following the music instead of just being a cycling animation. Another small but neat feature.Music fades out instead of shutting off instantly when changing songs.Songs are organized by folder, and by the order in which they were uploaded to the device, NOT alphanumerically or by metadata! For example, if track 05 is uploaded to this device first, then track 01, track 05 will play first and track 01 after. This causes issues if you copy whole folders to the device as the tracks might not be copied to the device by your file manager in proper order. So, you have to copy one track to the U3 at a time, from first to last, if you want tracks to playback in the same order as they are on the album. This device also doesn't support any playlists, only folders.All in all, it's an efficient and simple portable music player with built in FM radio, a replaceable AAA battery, SD card expansion storage, and good sound quality for low impedance headphones.

Amazon knows I don't do reviews🙂 however I had to try an help. I have purchased 8 of these Mp3 plyrs for personal use and gifts. I'm a Total music lover. They are the best i've found. I use mine with a case and without. The convenience is what i needed. When purchasing rechargeable durable batteries or not, allows the Mp3 plyr to run for 48 hours straight, the Mp3 plyr doesnt get warm or over heated. Now if you have the Mp3 plyr next to a heated sourse like in your shirt or pants pockets it will feel a little warm. So if u have music files in different formats this Mp3 plyr accommodates. Compatible with, Mac OS, Windows Xp, 7, 8, 10 or higher systems. When loading, plug directly into 2.0 or 3.0 usb, create a folder (or not) drag & drop. My folders holds over 1100 tracks (depending on the trks Mb's), for a more true sound from the device of course 256Mb or larger. The quality of sound depend on your choice, Normal, Rock, Pop, Jazz, or DBB. No adjustments for actual pitch (treble or mid range). As I stated your choice of the above mentioned. If u want hands free set your choices, no clip-on and tuck it. Fat 32 formated & that can be changed! Plenty of volume, which can be adjusted an preventable sound/volume lock! The latest one i purchased has a slightly different operating response to it, requires press an 2-5sec pause to get use to its functions. Manual an video very handy for those not use to this type of device. My entire household uses these Mp3 plyrs to this day an will continue until obsolete😔. This device plugs into any auxiliary thats standard. The sound quality is 😎 great for cars, boats, homes, dorms, at bbq's impromptu getogethers. I have not tried audibles on them, just music. Ear buds or headphones or desktop spkrs, laptops an some tabs, complements this device. Fm radio, voice mode, recordings, music, settings. Those are kinda standard for these types of Mp3 plyrs. Thanks you Amazon and AGPTEK!! 😎