If you are looking for a 100% waterproof mp3 player and earphones, check out the Aerb MD200
waterproof mp3 player!
The Aerb 4GB waterproof mp3 player comes with in-ear headphones as well as over the ear moldable hooks, a back clip and silicone ear tips (and ear buds) to provide a proper waterproof seal inside the ear canals.
The Aerb waterproof mp3 player has a large crocodile clip that allows you to clip the mp3 player in place while swimming or running. The earphones are designed to be worn through the front of your body rather than the back of your neck.
The waterproof mp3 player is so lightweight and super compact. It is about the size of a AA battery and measures only 1 cm wide.
As mentioned earlier, the Aerb IPX8 waterproof mp3 player comes with ear hooks that are hollow, allowing you to pull out the cable inside it for adjusting the earpieces inside your ears.
If you don't want to use the ear hooks, you can simply remove the ear hooks from the cable, which is pretty neat.
The Aerb waterproof mp3 player and earphones have an IPX-8 rating, which means they are 100% waterproof up to a depth of 3 feet (~1 meter).
Another nifty thing about the Aerb MD200 waterproof mp3 player is that because it's so lightweight it floats in water and being that it's bright green in color it means you won't have to worry about losing it in a swimming pool or at the beach.
With the Aerb mp3 player, you get 4GB of built-in flash memory storage space and two choices of audio format bitrate: mp3 (from 96 to 320 kilobytes per second (Kbps) and WMA (from 5K bps~320K bps).
Both of these audio formats deliver superb CD sound quality. Being that the earphones are waterproof, the sound is clear and bassy. The earphones are able to handle frequencies between 20Hz and 20,000 Hz.
When adding songs onto the mp3 player, it's just a matter of connecting the charging cable and dragging songs from your desktop computer onto the mp3.
As far as user controls, you get four buttons in total that allow you to control the volume, skip tracks, shuffle songs, play/pause and power on/off the unit.  The mp3 player transfer connection is via USB 2.0 though it's backwards compatible with USB 1.0
The volume buttons (long presses) double up as the skip-track buttons, while the shuffle mode can be set to "Normal" mode which means you can play tracks one by one in the order you upload them. The play/pause button (short press) doubles up as the power on/off button (long press)
The battery can hold well over 20 hours of battery life and charging the Aerb waterproof mp3 player is done via the included USB to 3.5mm jack.