. Introduction 2. Headphone Features www.h2oaudio.com Removable Neckwrap The H2O Audio Underwater Headphones provide audio directly into the ear through a waterproof speaker assembly at depths of up to 10ft.(3m) when coupled with the H2O Audio Waterproof Case. Adjustable Ear-clips The headphones include watertight speakers, made for complete submersion and designed with an adjustable frame to stay secure during the most active watersports. The headphones feature a 3.