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I've used every SwiMP3 model Finis has come out with since the beginning. It's addicting in the sense that once you get introduced to this style of patent pended bone conduction audio, it's hard to imagine going back. And, with previous models, there have been many shortcomings as it relates to product durability and the infamous ability to connect your device to the computer much less a USB charging hub... Here is what they don't tell you because they probably don't even know- the contacts on the unit are prone to mineral build up- to the point of no longer being able to connect or charge the unit. I've had conversations with their tech support department and they have sent me replacement chargers and even issued a RMA for a replacement. NO NEED- if you are having connection issues- here is the ultimate tip I can share... Go to a hardware store and buy some CLR- the calcium, lime rust stuff you use for other things. Fill it in short glass just high enough to submerge the side with the contacts (only about 1/2 inch or so deep). Soak your unit for 4-6 hours and then rinse- the contacts are as good as new!!! I stumbled across this solution when I was using CLR to clean the spray nozzle of the kitchen that had a lot of build up- who knew. No more need for a RMA, and the unit connects to the dock (magnet or no magnet) every time (make sure it's dry of course). As for their rubbing alcohol method with a qtip- tried it- does not work. But think about it- you wouldn't use alcohol to remove your mineral build up on anything else, so why use it on your unit you are swimming with?! Other tips- loop just one of the 2 straps to the unit of your goggles that have double straps. That way- he unit is secure enough to be stable through flip turns but does not mess with your goggles leaking depending on how they are positioned on your head. In past versions and even in this one, my goggles are prone to leaking if I put both straps over the unit. I have done the infamous Big Shoulders 5k open water swim and the monster swims (100x 100s on set interval) with this unit and never had an issue following the tips I shared above. I swim masters and hit about 4-6 practices a week depending on if I'm doing doubles for part of the season.