Compré éste producto por que sudo mucho al hacer ejercicio y muchos auriculares que se dicen contra agua, se han descompuesto por la humedad. So save your money on mega price headphones and spend it on a great front end & amplification. Their main function - a bluetooth headphone - is generally superb. I have also had it not pair at all and had to restart the headset. Awesome reminds me of Mardi Gras I use it with our Titan Fitness 2" Olympic Plates Bar. The strap did not slip after I put tension on the strap to hold the kayak in place. Additionally, an insufficient number of screws & nuts were provided to complete the assembly. It does slow down as it warms up when transferring larger amounts of data - I noticed it slow considerably after about 100GB of continuous throughput. All in all, this is a great book that Im sure lots of people will love.