This communication set uses a Bluetooth module that pairs with your cellphone and the UHF earpiece – invisible in your ear, and it is transmitting the sound from the cellphone to the earpiece.
The Bluetooth module has automatic answer and you don’t have to press any buttons in order to receive the call.
It has a built in microphone that enables your phone partner to hear you, or the environment where you are. The Bluetooth device also has a built in rechargeable battery that holds up to 5 hours.
The UHF earpiece is the smallest possible radio receiver and is completely invisible in the ear canal. It works with normal watch batteries, that holds up to 5 hours (depending on the battery brand).