I like it but this is not a product to try to transfer a lot of files at once some don't work.

After a year of using this mp3, 5 days, 40+ hrs a week, I've found it's worth the money. Keeping it simple:
+1 for build quality
+1 for ease of use and portability
+1 for battery life (~8 hrs)
+1 for audio/video
-1 glitches and connectivity issues

Was originally in search of a music player to use during my busy work week. Needed something with a good battery life, easy to transfer music/video, Bluetooth connectivity and possible storage expansion just to name a few. After some research online, found this mp3 and decided to give it a go. It was about ~$50 at time of purchase and I'd say it was a good investment. For reference, my audio headset of choice was a Powerbeats 3.
Having met most all of my required criteria, I've been using it nonstop and found 1 major issue mixed with a couple others. The one major being it would disconnect from my headset randomly and wouldn't reconnect for random intervals of time but then would reconnect and otherwise be fine thereafter. Not sure if this is a one off problem but with my particular mp3, it was a regular occurrence. Other than that, the OS was fairly slow and was a disappointment compared to other devices on the market. Every time I would turn on the screen and go into a music file, the system would need to load everything and would take roughly 2 minutes, sometimes less, sometimes more, time of which you are not able to use anything on screen but would hear audio playback just fine. Despite having more or less music would not change this issue, imagine having to load every screen for 1-2 minutes and that's what it would be like. Again, not sure if this was specific to my device but it was there nonetheless. Other qualms would be with video quality but are to be expected as this not a "top of the line" music/video player. One last thing would be that the charging cable would not be properly seated upon insertion and would be disconnected with a generous tug. Not too big a issue as it would charge and connect to other devices just fine and have no other problems.
Toward the end of my devices life span, I saw that the screen would steadily be detaching from the body and I figured it was just sliding off due to failing adhesive. However, I one day pulled it out of my pocket to find it half detached due to an inflated battery. I am not sure what could have caused this. It is worth noting that the device has never been dropped or beaten in any way and I would simply chalk this issue up to being in a warm pocket for so long. It's also worth mentioning that the battery didn't explode but is expanded to the point where the screen was pushed off and the device no longer works (refer to pictures ).
All in all, it had a good run and I'd recommend it if you're looking for a easy use mp3 player with good battery and seemingly long life expectancy.

I wanted something that isn't a smart phone for my alarm clock, that is small/portable, and that plays MP3s for the hour I'm getting ready in the morning. Bluetooth support a big plus. This little device has fit that need perfectly:

I keep a pair of wired computer speakers in our bedroom. At night they plug into this device (which is also plugged in so it's fully charged the next day). In the morning, after I turn off the alarm I typically select some music to help wake and start the day. When I'm ready to move from bedroom to anywhere-else, I switch on my battery-powered portable stereo wireless bluetooth speakers. ($15 at Ace Hardware with sound more like $40 speakers.) The music automatically switches to these and I move those with me as I start my day.

Here is why this device's specific features work well for me as a replacement clock-radio:

* It's an Android (based on 1.x or something really old but I don't care) but without the Play Store. Since I deliberately wanted something limited this was a feature, not a bug and I immediately knew how to use it.
* It has the stock Android clock application with its nice flexible alarm clock application.
* The MP3 player is quirky but once I got used to it I found I like it a lot. It's not any of the stock Android MP3 player applications but a third-party app. As other reviewers have noted, it works well for collections organized by folder. Note that you'll have to go hunting for a setting that turns this feature on. It's apparently licensed demoware but the vendor didn't turn the nagware banner off. That's annoying. And because (again) the Play Store isn't available, there's no way to even pay to turn it off. I hope they fix that in a future version of this product.
* The FM radio works well. I don't use it a lot but it's a really nice bonus to have it and I've gotten good reception out of it. (You have to have speakers or headphones plugged in to use it.)
* The sound quality is very good for the price, both over Bluetooth and via the headphone output.
* The built-in speaker is usable as an alarm clock, countdown timer, or for listening to lectures. Its quality is painful for listening to music.
* I've never fully discharged the battery, even with playing constantly over Bluetooth for somewhere between three and four hours. I'm really happy with the battery life for my purposes.

Some overall thoughts:

* I like that this setup is completely modular. If a speaker system fails I can replace it independently to everything else, etc.

* I don't use the web browser or video feature at all. It's really not designed for that use. But the settings allow you to hide applications you don't want to access from the home screen and I use this to remove icons for these applications. I really like this feature.

* At around $50, I didn't expect high-end phone build quality so I wasn't disappointed that the device is plastic. But it has held up fine for my use. And plastic doesn't crack like phone screens can. It does need a wipe from time to time with one of my leftover lens cloths (from an old pair of glasses) to remove fingerprints.

* The clock application doesn't have any setting to keep the display on when the device is plugged in. This would be nice, but it's hardly a deal-breaker. The clock and alarm are still reliable and that's what counts.

Overall, except for the nagware banner I can't remove I couldn't be more delighted.

I like this little media player based on android OS easy to operate and quiet intuitive, file transfers are speedy. Videos renders beautifully in high quality. It gets hot when in operation. The capacity was misleading as listed it was 72GB but actually 8GB internal, adding a flash card with up to 128GB makes it more enjoyable since hq videos consume most of its internal capacity seriously fast. You can watch youtube videos in HQ. The player's internal battery is long lasting but connecting it to a power source is recommended if watching and playing media continuously. Use a headphone to enjoy the full high quality audio and if listening to fm radio function. With all its features and capabilities it is almost a cellphone without its calling capability. Surf the internet, watching videos, listening to mp3s, reading ebooks, search your files thru its desktop É“rowse function, read and write files to all its available storage, etc. Quite happy with my purchase. Thank you. Highly recommended.

I tested six different popular MP3 players currently available on Amazon and was very pleased with the UI that the TIMMKOO Q5 provided.

My two finalists that I tested were this MP3 player (Q5) and the very similar Louran M4. They almost seem like rebrands of each other but there are some significant hardware and software differences between the two:

Hardware wise
a. The M4 casing is glass and aluminum (increasing the weight and potentially reducing durability); the Q5 is lighter as the casing is plastic (also has more case colors available)
b. The mic is much better with the Q5 vs. the M4.
c. The FM antenna is much better with the Q5 vs. the M4
d. The home and back buttons are much easier to see on the Q5 vs. M4. That being said these buttons should have been backlit as they are still difficult to see.
e. The screen is more vibrant with better viewing angles on the M4 vs Q5
f. The Wifi antenna is slightly better (DL speed of 18Mbps vs 14Mbps) with the M4 vs. Q5 (though they both aren't great; I was getting 5x better WiFi DL speeds on my Samsung S6 when testing at the same location compared to these units).
g. While the specs indicate the Q5 has a larger battery (1800mAh vs. 1500mAh), I didn't see any difference in battery capacity when testing both products after leaving the screen on for 30 minutes at full brightness and both the WiFi and BT antennas turned on.

Software wise
a. The web browser is better for the M4 vs. Q5. I couldn't figure out what browser the M4 uses, but it allows downloading files and YT video watching; the Q5 uses the VIA browser (ver. 4.3.6) and does not allow downloading files (stalls out and then fails) or YT video watching
b. Different media players are installed (M4 uses generic media player app which I can't seem to identify) and AMP, the Q5 uses the HyByMusic app)

Other than that they are identical in terms of the other apps that are loaded on (eBook Reader, Dictionary, Calendar, Calculator and Clock) as well as the Android OS version they are using (both are using an extremely limited version of KitKat using the same kernal version; 3.4.67).

In the end I actually prefer the Q5 over the M4 as I prefer the HyByMusic app over the music apps the M4 provides and I like that the Q5 has a much better FM antenna (I couldn't get any stations with the M4 and could get many with the Q5 using the same wired headphones I used when testing both). The Q5 also would seem to be more durable and due to its plastic casing is lighter in weight.

I was shocked to find that the TIMMKOO really handicapped it's OS by disallowing unknown sources to be installed (i.e. no app side loading allowed) and providing a browser that both does not allow video watching on YT or downloading files of any kind. That being when reviewing the Amazon Q&A of the Louran M4 product I noticed that a Louran CS rep answered a question about side loading apps with the following message:

"Hi. The current M4 is a basic version, with only 8GB ROM and 1GB RAM. In order to maintain a smooth user experience, we have to disable the downloading and installation of other apps. In the next season, we will be launching the M4 Pro with 32GB ROM and 3GB of RAM, and at that time we will release the app downloading and installation. Thanks for your understanding and patience."

For this reason I'm going to be sending the Q5 back and wait until the Louran M4 Pro comes out (hopefully this will be soon) as I think having the ability to sideload apps will be a real game changer for this product (for podcast playing and web music). Hopefully TIMMKOO is also planning to release an updated version of the Q5 that allows for side loading to compete with the Louran M4. Unlike the specs for the soon to be released M4 Pro, TIMMKOO really doesn't need to upgrade the storage or RAM hardware on the Q5 MP3 player as it is very responsive with the current RAM on board (1GB) and storage space increases can be easily done by adding a SD card. It would be great if TIMMKOO would just release a firmware patch to upgrade the Q5's OS rather than releasing a whole new player to compete with the M4 Pro. If TIMMKOO does decide to release a "Pro" version of the Q5, I hope the price doesn't change dramatically as I think $50 price point for a medium size MP3 player is the most the average consumer would pay since all of the capabilities on the Q5 are even low end rated phones already.