Final Update of my review. First a little background. I am Masters Swimmer, I swim 3000 yards - 5000 yards, every day, ( weekends too ). I am in the water at least 90 minutes every day, so my products get thoughly tested. After buying and trying the APGTEK swimming MP3 player, I am circling back to this one. The only issue this player has is it seems to leak after a while. Something I noticed on other players is they silicon the screw holes, and all openings to ensure water can't get in. This one does not have any silicon over the screw holes. But the claimshell does have a rubber seal between the two parts. I am seriously considering buying another one of these, and then adding some water proofing to help keep the water out. Other than that, this is the by far the best swimming MP3 player on the market. Easy to load music on it. To turn it on you just hold the play button for a few seconds and it starts playing your music. Buttons are logically placed making it easy to adjust volume, and skip tracks. The low profile design and clip is excellent. When swimming I don't feel it on the back of my head even during flip turns, and under waters. The APGTEK on the other hand felt like a brick on the back of my head, in which the water rushing by during flip turns would rip it from my goggle straps. Plus the menu and navigation was almost impossible to use if you are not looking at the screen. Any player that promotes the rotating clip is crap. It just sticks too far from your head. The clips are weak, and it catches the water. This one is a clean design that does not catch the water. The first one I owned lasted me almost 2 years. The second one lasted 2 months. I was able to partially repair the first one by taking it apart, and removing the oxidation, then siliconing it back together. But That repair only lasted another 2 months. Now when I plug it in, it gets all hot, so I assume there is a short somewhere on the board. Even with all those issues, I am about to buy another one, because I feel its the best option on the market. I considered the syryn 2, but once again it has a clip that makes it just way to thick. The audio quality was decent, but bass not as good as the Sony's. But the Sony's were too easily ripped from your ears during flip turns and sprints, plus they did eventually leak. Comparing to other options. The bone conduction models, have terrible audio quality, and due to the placement, they will cause your goggles to leak. The over the ear models, like the sony's do not stay on during aggressive flip turns. Other models are too bulky and will catch water on your flip turns and under waters. If they could get these to last longer than a few months without leaking they would be a 5 star product. Hopefully with some sealant on the next pair I will fix that issue. I'm updating my review once again. After a little under 2 months this one has stopped working. It refuses to turn on or charge. The last one I bought lasted almost two years. Sad to see this one not even last two months. I thought about asking for a replacement but I have a feeling The quality of the replacement would not be much better. I'm going to search for some different options for swimming mp3 players. One thing I will say is the included earbuds work pretty well, but the bass lacks kick but they don't leak and they stay in your ears very well. I'm updating my review with some long-term data. I've now used this MP3 player for a little over 2 years. Overtime the 3.5 mm headphone jack contacts start to get a buildup of corrosion from the chlorine. Eventually this causes problems making continuity for audio to come out correctly and for charging to work. I found using some rubbing alcohol and a tiny pipe cleaner does an okay job to clean the contacts giving you good continuity again. Yesterday I went swimming and it wouldn't turn on at all. I thought that maybe the battery was finally wearing out so I took it apart and found some corrosion on the battery terminals, on the main board. I scrubbed it off. Then plugged it in and it started charging again I suspect some moisture got inside causing the issue. Battery still has full voltage and no issues. I put it back together and tried swimming again the next day this time I only made it about 200 yd before it stopped working again. When I got home I took it apart it was completely full of water. My theory is when you take it apart what looks like a little rubber seal is actually silicone sealant and it never makes a perfect seal when you put it back together again. I removed the seal and generously applied some fresh silicon sealant to make sure it's watertight when I put back together this time. Later that evening I went swimming with it again and had absolutely no issues. It worked perfectly. I've now used it for over a week straight and still solid. Just in case my repair did not work I went ahead and ordered a second one. Of course when the second one arrived I tested it had absolutely no issues. One thing I did notice is the new one the volume does not go as loud as my old one. So I don't know if they change the design in that respect. If you have issues with yours I recommend taking it apart removing the seal in generously applying fresh silicone sealant after you verified the internals don't have corrosion and are bone dry. Also be sure to test it to make sure it can charge while you have it apart before you put back together. Give it a few hours for the silicone to dry, and gently screw it back together. But don't over tighten it. If you bought one and it doesn't work it's pretty easy to fix. I swim laps at my local gym 5 days a week. Everything from Fly, 500s free, and even aggressive sprints. I have tried several waterproof MP3 PLayers. Thus far this has been the best one yet. Here is my break down of experiences. SEWOBYE Waterproof MP3 Player Small design, light weight, easy to transfer data, easy to charge, easy to clip onto goggle straps, does not leak. Volume goes very high, higher than you even need. Only con is the included earbuds are too long. 12" is a good length, and these are almost 20" long. The result is the water rushing bye will tug on the wires. If you get this player I recommend you also get the H20 earbuds with the Short cord. Those paired with this are almost perfection. The included earbuds are a little weak on the BASS, and the earbud tips are a little hard, causing discomfort once you get them jammed into your ear canal. They work, and don't leak, but upgrading to the H2O earbuds is a huge upgrade from these and worth every penny. The low quality ear buds are the only reason for loosing a star on the rating. Finis Duo Pain in the ass to hook on to your goggles. Once you get them hooked, and you adjust their position to be at the right spot for the music to be heard, they cause your goggles to leak. This might vary depending on what goggles you use, but I use the Form Smart Goggles, and this was my experience. Sound quality was not the best. Under water they are a little better, but bass is extremely weak. Sony Waterproof Walkman Easiest to put on, but the earbud tips do not fit well. They are either too loose cause water to get around them, or too tight not allowing your to get them deep enough into your ears. Plus I had to adjust my stroke so my shoulder wouldn't hit them ripping them out. Aggressive flip turns, forget about them. The water rushing by will rip them out of your ears. They easily leak and when they do, they stop working for a few days til they dry out, then they will start working again. Plus the volume doesn't go near high enough once you are under water.