It's super short range - like cm of range because water is really good at absorbing 2.4ghz. Other diving accessories for Apple devices use Bluetooth as a bridge

It's super short range - like cm of range because water is really good at absorbing 2.4ghz. Other diving accessories for Apple devices use Bluetooth as a bridge to their own radio / features, so maybe a slide-on case or watch band could add an adapter to a Mhz radio.