The AfterShokz Xtrainerz Open Ear Wireless Headphones are fully waterproof and submersible so you can swim, run, cycle, or train harder than ever before. These headphones work with bone conduction technology that guides mini vibrations through your cheekbones to your inner ears without plugging or covering them. Although not Bluetooth® compatible, the Xtrainerz have 4GB of built-in storage to hold up to 1,200 songs with full track and volume control at the touch of a button and let you enjoy eight hours of premium audio stroke after stroke. To match the demands of swimmers, they are fully waterproof, IP68 rated, to withstand complete submersion in up to 2 meters of water and are built with a complete wraparound titanium design that provides a flexible fit for unnoticeable all-day comfort and stability in and out of the water. Enjoy the convenience of voice commands with the integrated Audrey Says™ voice prompts that guide users through power, play mode, and more, all enhanced by PremiumPitch 2.0+ technology that delivers wide dynamic stereo sound and louder volume. Enjoy your favorite activity worry-free with the AfterShokz Xtrainerz Open Ear Wireless Headphones!