SHOOK OPEN SWIM WIRELESS BONE CONDUCTION MP3 SWIMMING HEADPHONES Take open-car listening to new depths. Open Sim {Formerly Trainer) is engineered with Choke's signature open-ear design and 7th generation bone conduction technology to ensure bud-tree, comfortable staffing al day, ir ar out of the water, Open Swim ore completely waterproof and submersible, and feature fair gigabytes of MP3 storage, so athletes can swim, run, cycle, and train harder than ever before.