Real-time underwater coaching for freedivers.
Coach during the swim—not afterwards.
Inside the receiver—bone conduction engineered to stay clear mid-stroke and through hypoxic phases.
Fewer interrupted dives. Faster technical improvements. More productive sessions.
Countdowns, relaxation cues, breathing reminders, safety communication and coaching through final contractions.
Tested in 25 m and Olympic 50 m pools—monofin, bifins and no-fins, depths to ~2.75 m.
Receiver sits just behind the ear under the swim cap or hood—unobtrusive throughout training.
Instant feedback, calmer safety drills, faster technical learning, less stop-and-restart.
Hear every cue clearly, stay relaxed in hypoxic phases, correct technique immediately, build confidence.
One transmitter can pair with multiple receivers—group coaching with consistent guidance for every athlete.
Instructor-led courses, safety supervision, pool-based skill development—one system.
Radio for the coach. Receiver for the athlete. Chargers and clip included—ready for the session.
Clear channels for focused cues. Scale from one athlete to group work as your program grows.
Real feedback from testing: without SONR it’s like being drunk trying to understand a conversation. With SONR—everything is clear.
Coaches and athletes on real-time cues in the water.
SONR really helps working with advanced level and distance swimmers. It’s good for private lessons and swimming sets. I recommend this product.
SONR is compact and easy to operate. The sound is clear and it works at a great distance. I want to purchase SONR as early as possible, so I wouldn’t have to raise my voice in a noisy pool anymore.
I love the small size, sleek shape and the design of the device. It is comfortable, unnoticeable under the cap and doesn’t add resistance while swimming.
I would recommend this product to professional swimmers and their coaches who are enthusiastic and eager to improve results at a faster rate. Thanks for a wonderful invention, SONR!
We found it was really helpful from a coach’s point of view for giving the swimmers feedback in real-time as they were moving along. The sound quality was really clear. I would definitely look to have SONR as a permanent feature that we could use on our camps.
This device is fantastic for pool training because the swimmers can hear with absolute clarity while they are swimming.
We were very impressed with how easy it was to get started, how comfortable it was when wearing it, and how effective it was when communicating with our athletes in the water.
We were very pleased with the SONR system, as it brings communication in swimming to the next level. We plan to utilise this with our open water swimmers, so more information can be provided to the swimmer.
I really enjoyed using the SONR unit. It definitely enabled me to make quicker, easier and more precise instructions to athletes on the go, while also being able to give feedback clearly.
I’m very surprised by what SONR helped me to achieve in training! I was asked by a lot of swimmers what device I was testing while using SONR and they were impressed as well.
Great concept which could have many uses by the innovative coach. I showed it to the local triathlon coach and he felt it provided good opportunities for him and his athletes. Other possible adoption could be in Synchro and also games sports like underwater hockey.
It’s an awesome tool for coaching and motivating swimmers during their sessions. You can remind a swimmer what to focus on without stopping them, and keep them updated on time and pace during long sets.
We use SONR with our college team and our campers when we are teaching technique. It’s awesome to be able to communicate with the swimmer while they are attempting to make stroke improvements. It’s easy to provide feedback in real-time.
I enjoyed testing this product. I teach swimming and the kids could easily hear me. The device was easy to use—younger kids did not even realize it was under their swim cap.
Static. Dynamic. Safety. Courses. One system for real-time underwater coaching.
239.99 €
Training solo? See SONR Music 2.