Stay Connected Underwater: Why Retekess TT120 Is the Ultimate Swim Coach Communicator

Retekess
May 19, 2026

Coaching swimmers has always been a challenge – not because of the athletes’ lack of effort, but because of the simple fact that humans cannot speak underwater. For decades, swimming coaches had to shout, whistle, or use hand signals, hoping their instructions would be understood. But today, technology has changed the game. The Retekess TT120 swimming training set is a dedicated swim coach communicator that allows real‑time, clear communication between a trainer and swimmers, even when they are completely submerged.

In this article, we’ll dive deep into the features, benefits, and real‑world use of the Retekess TT120 communications systems for swimming training. Whether you are coaching a local swim team, teaching water aerobics, or training triathletes, this underwater communication system might be the tool you’ve been looking for.

Why Underwater Communication Matters

Imagine this: you are a coach standing on the pool deck. Your swimmer is doing laps, but you notice their head position is off and their pull is losing power. To correct them, you would normally have to wait until they finish the set, pull them aside, and explain – which breaks the flow of training. By the time they get back in the water, the muscle memory of the mistake has already been reinforced.

Now imagine being able to speak into a microphone and have your swimmer hear your voice instantly – while they are still swimming. That is exactly what the Retekess TT120 underwater transmitter offers. It turns the pool into an interactive classroom, improving technique, pace, and motivation.

What Is the Retekess TT120 underwater communication system ?

The TT120 is a wireless, waterproof communication kit designed specifically for water sports. It consists of a coach’s transmitter (worn on the belt or lanyard) and one or more bone conduction receivers (headphones) for the swimmers. The system works in both fresh and salt water, and it’s used by swim clubs, triathlon coaches, surf instructors, and even windsurfing or kitesurfing trainers.

Unlike general‑purpose radios, the retekess tt120 swim coach communicator is built from the ground up for the wet, noisy, and dynamic environment of a swimming pool or open water.

Key Features That Make the TT120 Stand Out

Let’s break down the technical specifications and how they translate into real‑world benefits.

1. Waterproof Ratings You Can Trust
Receiver (student headset): IP68 – fully waterproof and can be submerged for prolonged periods. Swimmers can wear it for entire training sessions without worry.

Transmitter (coach unit): IP54 – splash‑proof and resistant to accidental drops into water. It’s safe to use near the pool edge or on a boat.

Many products claim to be “water resistant,” but the TT120 actually delivers submersion protection. This is not a fragile electronic device – it’s a rugged training tool.

2. Bone Conduction Technology for Safety and Comfort
Traditional earphones block the ear canal, which is dangerous in water where swimmers need to hear ambient sounds (like a lifeguard’s whistle or another swimmer approaching). The TT120 receiver uses bone conduction – it rests just outside the ear, transmitting sound through the bones of the skull.

Benefits:

Swimmers hear the coach’s voice and the environment at the same time.

No ear pressure or discomfort, even after hours of use.

The receiver stays in place regardless of flip turns or dives.

Weight is only 39 grams – barely noticeable.

3. 9 Channels – Train Groups or Individuals
The system operates on 9 independent channels. This opens up several coaching scenarios:

One coach can run 9 different training groups in the same pool area without interference.

Alternatively, a single coach can send individual instructions to up to 9 different swimmers (each on a separate channel), while also broadcasting to everyone on a common channel.

This flexibility is rare in underwater communication systems and makes the TT120 suitable for everything from elite team training to learn‑to‑swim classes.

4. Impressive Transmission Range
Above water: up to 120 meters (390 feet) – the coach can stand at one end of a 50‑meter Olympic pool and still reach swimmers at the far end.

Underwater (1.5–2 m depth): up to 50 meters – enough for most lap pools and open water swimming near the coach’s boat or dock.

No more losing connection during a long set. The signal remains stable even when the swimmer is completely submerged.

5. Dual Microphone Inputs
The transmitter comes with:

A built‑in microphone (good for most poolside coaching).

A lavalier (lapel) microphone for hands‑free use in noisy environments or when the coach is also in the water.

In addition, the transmitter supports external audio input – you can connect a music player or a pre‑recorded instruction track. Imagine playing a metronome for pacing drills, or streaming motivational music during a warm‑up.

6. Battery Life and Magnetic Charging
Transmitter: 5‑hour charge → 10 hours of operation.

Receiver: 3‑hour charge → 5 hours of operation.

Both units use magnetic charging – the cable snaps into place easily, even with wet or slippery hands. This also avoids wear and tear on physical ports, improving long‑term durability.

7. One‑Touch Mute for Coaches
Sometimes you need a private conversation or a moment of silence. A short press on the transmitter’s power button mutes the audio – swimmers hear nothing. Press again to resume. Simple, intuitive, and very useful during busy training sessions.

What’s in the Box? And What Else Can You Buy?

The Retekess TT120 is sold in several configurations:

1 transmitter + 1 receiver (starter kit)

1 transmitter + 2, 4, or 6 receivers (best value for teams)

Extra receivers sold separately (5‑pack or 10‑pack)

You can also purchase useful accessories:

TT120 Swimming Waterproof Bone Conduction Receiver – add more student units.

TT002 16‑Port USB Charging Base – charge up to 16 receivers at once.

Audio Cable for TT120 – connect external audio sources.

The official store offers exclusive discounts for corporate or club purchases (3+ sets).

How to Use the TT120: A Quick Setup Guide

Charge both transmitter and receiver fully.

Turn on both units (long press the power button).

Select a channel on the transmitter and match it on the receiver. You can also broadcast on a channel that multiple receivers are tuned to.

Wear the transmitter – clip it to your belt or hang it around your neck with the lanyard.

Fit the receiver on the swimmer – the bone conduction headband goes behind the head, with the pads resting just in front of the ears.

Speak normally – no need to shout. The swimmer will hear your voice underwater.

To mute, short press the power button on the transmitter. To change volume, use the buttons on the receiver.

No complex pairing, no apps, no Bluetooth drops. It just works.

Who Is This System For?

Swim coaches – correct technique in real time.

Triathlon trainers – give pacing and navigation cues during open water swims.

Water aerobics instructors – lead a class without screaming over splashing.

Speech therapists / special needs educators – use the clear audio feedback for water‑based therapy.

Kitesurfing / windsurfing / SUP coaches – communicate with students who are far from shore.

Tour guides – at water parks or snorkeling tours (the receiver works above and below water).

Even security teams at water parks or pool facilities have used similar systems to coordinate lifeguards, though the TT120 is primarily designed for coaching.

Customer Feedback and Real‑World Performance

A professional swimmer and coach from Italy tested the TT120 swimming communications systems and gave excellent feedback. The coach noted that:

“For the first time, I can correct a swimmer’s hand entry without stopping the whole set. They hear my voice the moment they make the mistake. Within two sessions, their stroke improved dramatically.”

Other users highlight the durable, water resistant, and intuitive operation of the headphone receiver. Even after hundreds of hours in chlorinated pools, the bone conduction drivers remain clear and the seals stay tight.

A common question from new buyers is: how to enable pairing mode? The answer is simple – the TT120 does not require traditional pairing. Just set both units to the same channel, and they connect automatically. There’s no button‑pressing ritual. That’s one reason why coaches love it: it’s ready in seconds.

Comparison: TT120 vs. Other Underwater Headphones

You might have searched for underwater earphones for swimming or underwater headphones for swimming – those are usually MP3 players for listening to music. They don’t allow two‑way or one‑way coaching. The TT120 is different: it’s a water receiver and transmitter system designed for live communication.

Other searches like underwater transmitter and receiver or underwater radio transmission system manufacturer often lead to expensive dive communication gear that costs thousands of dollars. The TT120 brings professional coaching capabilities to a reasonable price point.

Is It Easy to Use with a Large Team?

Yes. Because each receiver is independent and channel‑selectable, you can issue individual instructions or broadcast to the whole team. For example:

Put beginner swimmers on channel 1.

Put advanced swimmers on channel 2.

Announce a group drill on channel 3 (all receivers on channel 3).

Privately tell one swimmer to adjust their breathing – on their personal channel.

The system does not support two‑way student‑to‑coach audio (that would require a much more complex and expensive setup), but for coaching, one‑way instruction is exactly what you need. The coach speaks, the swimmers listen and react.

Why the TT120 Is Better Than “Water Talkie” or “Swimming Radio” Alternatives

Some people search for a water talk device or water talkie for sale expecting a walkie‑talkie that works underwater. Standard walkie‑talkies use VHF/UHF radio frequencies that barely penetrate water. The TT120 uses a low‑frequency magnetic induction method, specifically designed for water conductivity. That’s why it can reach 50 meters underwater while a normal two‑way radio would fail after a few centimeters.

Similarly, a swimming radio that receives AM/FM broadcasts will not help a coach give live feedback. The TT120 is purpose‑built for coaching, not entertainment.

Pricing and Value

At the time of writing, the official Retekess store offers:

1 transmitter + 1 receiver: $147.99

1 transmitter + 4 receivers: best value pack – perfect for small teams.

Additional receivers: $79.99 each when bought separately.

The kit includes a 3‑year warranty, 30‑day money‑back guarantee, and free lifetime customer support. Bulk discounts are available for clubs that need 3+ sets.

Given the build quality, IP68 receiver, bone conduction technology, and 9‑channel flexibility, the TT120 is one of the most affordable underwater communication systems for sports coaching.

Final Verdict: Should You Buy the Retekess TT120?

If you are a swimming coach, water sports instructor, or team manager who is tired of shouting and guessing whether your athletes heard you, then yes – the TT120 is a game changer. It is:

Reliable in both fresh and salt water.

Intuitive to set up and use (no pairing mode confusion).

Comfortable for swimmers of all ages.

Durable enough for daily training.

The only downside? Once you start using it, you’ll wonder how you ever coached without it. Your swimmers will improve faster, your sessions will be more engaging, and your voice will thank you.

“How to enable pairing mode?” – You don’t. Just select the same channel. That’s it.