Bluetooth neckloop now is powered by new F class audio amplifier and now offers more powerful output audio signals. Allows you to pause/play even change songs by simply click buttons. Mute function is also works for music player. The smallest high quality hidden Spy Earpiece. It's tiny size Dia7xH11mm makes it completely invisible in the ear canal. Works with all of the inductive transmitters. It has new advanced battery holder, no worry about broken battery holder any more. The smallest hidden Spy Earpiece is with an optimum anatomic design. It allows inexperience users easily wear it. .