This mini earpiece is an electromagnetic wave inductive and receiving device with a micro earpiece designed to fit exactly in ear canal for secret communication. The sound is clear, but not as loud as a normal earphone, so it's not recommended to use in a loud area. How can it be used? -Communication for Security -Students -Law enforcement -Private investigators -Business Professionals 1)How do you wear the earpiece? - Clean and dry out your ears thoroughly before use -Wear the loop set, connect batteries & connector & plug the jack into your phone -Turn volume on the lowest setting -Turn your head to the left or right so your ears are horizontal to the ground and ceiling. Place the earpiece in your ear. You will hear a noise when it touches your ear drum. NOTE: It must touch your ear drum to function.