Frequently Asked Questions


What is bone conduction?

We perceive sound in two ways: through air conduction and bone conduction. Air conduction is the primary method of hearing, where sound waves travel through the air and reach our eardrums. The eardrums then convert these sound waves into vibrations and transmit them to the cochlea.

On the other hand, bone conduction occurs when sound waves bypass the air route and travel through the bones of our jaw and skull. These vibrations still reach the cochlea, just like in air conduction, but without involving the eardrum. Both methods ultimately lead to the same destination: the cochlea.

Is SONR Coach safe to use?

As SONR Receiver works on bone conduction technology, it is safe to use by kids and adults. Bone conduction is simply hearing sound through vibrations in the jawbone and skull. SONR is a wearable receiver that does not emit any waves or signals. Moreover, it is certified with CE, RoHS, and FCC, ensuring its compliance with quality and safety standards.

What's SONR Coach battery life?

The battery life of the SONR Receiver is up to 1.5 hours in constant talking mode and up to 3.5 hours of mixed usage. The Radio Transmitter offers up to 4.5 hours of mixed-use and a standby time of up to 5 days.

Is SONR Coach waterproof?

The SONR Receiver features an ATM5 waterproof standard, ensuring protection against water. You can use the receiver in different types of water, including open water, chlorinated pools, and salt water. The Radio Transmitter provides dust and splash protection, it is not waterproof and should not be submerged under water.

In what types of water the SONR Receiver can be used?

The SONR Receiver is suitable for use in all types of water, including open water, chlorinated pools, and saltwater environments. For optimal maintenance, we advise rinsing the device with fresh water after each training session and wiping it with a towel after use.

How many SONR Receivers can be connected to one radio?

The coach has the ability to train an unlimited number of swimmers simultaneously using a single radio transmitter. With 6 channels available on the radio, the coach can efficiently provide instructions and corrections to the entire team, offer private guidance to individual swimmers, or divide the team into smaller groups.

How many coaches can use the SONR Coach communication system in the same pool?

Up to 5 coaches can use the SONR Coach communication system in the same pool at the same time.

How to wear SONR Receiver?

SONR Receiver can be placed anywhere on the swimmer’s head - under the swimming cap or on the strap of the goggles using a special included clip. Thanks to its sleek and lightweight design SONR Receiver looks great on any swimmer’s head. After just a few minutes of training, the swimmer forgets about the presence of the receiver, being able to stay fully focused on the training.

How to pare the SONR Receiver with the Radio Transmitter on a private channel?

While the receiver is turned on, triple press (•••) the button on the receiver. The device should start to blink the current channel number.

In order to change the private channel, do the following:
1. On the radio transmitter, switch the big dial (B) to a desired channel (between 2-6)
2. Keep the SONR receiver at a distance from the radio transmitter
3. Press and hold the talk button of the radio transmitter, then triple press (•••) the button on the receiver.

The receiver should start to blink the new channel number it has found.

Note: After turning off the receiver, the secondary (private) channel will be set back to default, Channel 2.

What is the VOX function of the Radio Transmitter?

To enable and disable the VOX function, you need to perform a short press on the D button (1 second) on the SONR radio.

The VOX function allows transmitting audio from the radio to the receiver without pressing the receive (C) button. This means that when this function is activated, your radio will switch to a continuous sound transmission mode (continuous signal) to all receivers in the vicinity, on the same channel as the radio. It's important to know that with the VOX function turned on, your radio's battery will deplete approximately 2.5 times faster, as the device will operate without pauses. Additionally, every 30 seconds, the radio will send a single sound signal (beep) to the receiver to ensure that the receiver is on and receiving sound.

Can SONR Receiver be connected via Bluetooth?

SONR Receiver cannot be connected via Bluetooth. It works only with the Radio Transmitter.

What input does the  Radio Transmitter have?

You can connect a headset with a microphone to the radio transmitter, which features a K-type input (Kenwood).

Does SONR Coach play music?

The SONR Coach is not designed for playing music. Warning - Do not connect the radio transmitter to any third-party media music source using connectors.

What Warranty do SONR Products have?

SONR Products come with a 1-year warranty that automatically activates upon receiving the products.


How to track my order?

After placing your order, you will receive a tracking number that allows you to track your order. You can track it at

What is the delivery time? How long does the delivery take?

The standard delivery time is between 9 to 15 working days, with exceptions for remote regions.

What should I do if I cannot find my country in the delivery list?

In case you cannot find your region in the delivery list, please contact us directly on

For any other question please contact us directly.

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SONR Coach Basic set includes a receiver and radio transmitter.