How frequency technology works

The headphones rest in front of your ears and transmit sound through vibration, leaving your ears open to your surroundings.

Pair them through your phone’s Bluetooth settings, then choose audio in the HFH app. Generated tones and recorded sounds are different listening options. You can play them together or separately.

Start at a comfortable volume. If you cannot hear audio or feel the expected vibration, follow the troubleshooting guides below.