Megafeis E350 16GB Waterproof Bluetooth Wearable Wireless MP3 Player (Blue) for Swimming

This seemed like the perfect product for me, Bluetooth headset when out of the water and MP3 player when swimming. The Bluetooth aspect actually was okay. No real issues: it paired easily, sound was clear, and reception was comparable to my other similar style sport bluetooth headphones.However, when swimming, I switched to the MP3 player function to play songs that I put on it and that when the problems started. It would play one song and then switch to bluetooth mode when going to the next track. It was then constantly going to bluetooth mode, even after rebooting the earphones. Trying to toggle the bluetooth setting did not work, once it was in bluetooth mode, only rebooting the device would bring it to the MP3 player mode.When it was playing the song the sound was great while swimming. I even managed to do some flip turns during my pool laps and it stayed on my ears no problem. They were very comfortable when swimming.Now, just days after receiving it, the device doesn't want to hold a charge anymore.