H2O Audio Sonar 2 Pro Underwater Headphones

You've tried swimming with music before. Earbuds that fall out on flip turns. Bulky headbands that slip under your cap. Sound that gets muffled the second you push off the wall. Most headphones either just don't sound good underwater or aren't practical enough to use. Bone conduction headphones weren't actually designed for water—until now.

The H2O Audio Sonar 2 Pro is a bone conduction headphone system engineered specifically for underwater performance. While other brands adapted land-based tech for the pool, H2O Audio started from scratch to solve the actual problems swimmers face.

Better Subsurface Sound

Here's the science made simple: traditional headphones need air to carry sound waves. Underwater, that's a problem. Bone conduction sends vibrations through your skull bones directly to your inner ear, completely bypassing the eardrum. The Sonar 2 Pro's enhanced speakers are tuned to the specific frequencies that travel best through bone in wet conditions—that's why the sound stays clear lap after lap.

Here's why H2O is a notch above:

Security When You Need It – Instead of a headband that shifts under your cap, the Sonar 2 Pro clips directly onto your goggle straps. Two compact speakers sit right where they need to be—no adjustment mid-lap, no pressure on your ears, 40% smaller than traditional swim headphones.

Bone Conduction Built for Water – Most bone conduction headphones lose clarity underwater. The Sonar 2 Pro uses swim-optimized speakers that deliver consistent, powerful sound whether you're doing technique work or hammering intervals. The vibrations cut through water resistance instead of fighting it.

8GB Storage + PLAYLIST+ – Bluetooth doesn't work well underwater—you already know this. The built-in MP3 player holds 2,000+ songs (MP3, M4A). The game-changer? PLAYLIST+ lets you record playlists directly from Spotify, Apple Music, or any streaming service. Just hit play on your phone, double-tap the + button, and the Sonar 2 Pro captures it for later.

How to Use Audio Sonar 2 Pro

Clip onto goggle straps before you swim. Download music via the H2O Audio PRO app or use PLAYLIST+ to record from streaming services. Charge for 2 hours, get 10 hours of playtime.

Pro tip: Use the included earplugs for even better sound isolation and bass response.

Triathletes and lap swimmers are switching to the Sonar 2 Pro because it solves the one problem every other system creates: staying in place while delivering true sound quality. IPX8 waterproof to 12 feet means it handles flip turns, open water, and everything between.