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The Duo can be used while swimming. It has an IPx8 rating, so the headphones can be submerged in depths of up to 3 feet for 30 minutes.
Pro On-earpiece controls
You'll be able to easily control music playback using the on-earpiece buttons. Controls include play and pause tracks, next and previous tracks as well as a shuffle button.
Pro Easy to use/fit on the head when swimming
You won't have a lot of problems properly positioning these headphones. The FINIS Duo features bone-conduction tech so they do not have to be inserted into the ears, but instead can simply be placed on the ears. You won't have to worry about proper insertion into the ears or these headphones falling off.
Pro Can play music off of internal memory
You can play music off of the FINIS Duo without connecting it to a music player. It has 4 GB of internal memory to store music in.
Con Doen't sound great when not submerged
The bone conduction technology works best when the headphones are submerged. When off the water, conduction is not very efficient, which results in less-than-ideal audio.