***** **********Best Quality Guranteed. *****Ear bone is hidden in your ear canal; it isnt sensitive to background noise; excellent use in high ambient environment; such as driving; riding motorcycles and bicycles*****2 pin noise reducing ear-vibration earbone earpiece headset finger PTT (push to talk); for Kenwood Baofeng UV-5R BF-888S BF-F8HP H-777 RT17 RT18 RT22 Arcshell AR-5 WOUXUN radios*****Bone avibration conduction design; works by vibrations; sound transmit via cheekbone to your cochleas; which avoids hearing impairment compare to ordinary earphones; unilateral design helps you stay alert to your surroundings*****Without a separate microphone which could be easily detected by people around you; this two way radio earpiece is 2-in-1 speaker/mic*****Ideal for surveillance purposes and security at airports; casinos; crowd control at conventions and concerts; and other working environment requiring discreet communications