Abstract: A microphone positioning structure is connected to an audio output device, and is composed of a sound tube, an end of which is connected with the audio output device; an earplug part which is located at a tail end of the aforementioned sound tube; an ear-hook part, an end of which is connected with the aforementioned sound tube. An end of the sound tube is plugged into the audio output device such as a trumpet or a loudspeaker, the ear-hook part is hung on a user's auricle for positioning, and the earplug part is inserted into the user's ear. In addition, while listening, the ear-hook part is hung and fixed on the user's auricle; therefore, the earplug part will not be subjected to a force, and it will not be fallen off due to a force of gravity and a shaking.

Abstract: An adjustable ear-hook earphone with a microphone is disclosed. The apparatus includes an ear hook, a main body and a microphone, wherein the main body have a limiting part and an adjusting post sleeved in a sleeve of the ear hook, thereby the main body are adjustable and moveable in a specific angle ranged from 0 to 210 degrees.

Abstract: An extended microphone for a radio communication equipment is disclosed. The extended microphone includes a microphone body; an adapter for connecting the extended microphone with the radio communication equipment; a GPS module disposed on the microphone body for providing a positioning message; and a display module disposed on the microphone body and connected with the GPS module for receiving the positioning message and displaying the positioning message thereon.

Abstract: A back clip fixture of a receiver and transmitter device assembled by a back clip and a receiver and transmitter device is characterized that a concave slot is respectively disposed at positions opposite two sides of the detachment seat for facilitating the mounting and dismounting of a joint seat piece; more especially, the lower positioning piece has a slot location for fitly assembling an upper positioning piece; furthermore, the upper positioning piece has a notch disposed thereby providing a larger space for a resilient piece to separate from a positioning slot so as to increase the detachment effect.