A megaphone, speaking-trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person’s voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves radiate out the wide end. A megaphone increases the volume of sound by increasing the acoustic impedance seen by the vocal cords, matching the impedance of the vocal cords to the air, so that more sound power is radiated. It also serves to direct the sound waves in the direction the horn is pointing. It somewhat distorts the sound of the voice because the frequency response of the megaphone is greater at higher sound frequencies.
Pro-Sound CM-006 Handheld Megaphone, 20 Watts with recording and Rechargeable made in china. This Hand Held Megaphone has a built-in Microphone and the sound covers an area approx. 350 meters.
Features
ER-66 USB 25W rechargeable handle megaphone suitable for demonstrations, rallies, teachers, coaches, street sales, conferences, sports activities, advertising, etc. Includes shoulder strap. Microphone with detachable switch with extendable cable. It is powered by 8 R14 alkaline batteries (type C) or directly from a 12Vdc source of at least 3A or used with a battery (the battery and batteries are not included in the package).
Features
ER-66 is a handgrip megaphone with a detachable PTT microphone featuring 25W power and 700 meters range with excellent intelligibility. For more flexibility several additional options are available:
Features
ER-67S is a powerful megaphone of 40 W featuring1800 meters ranges with excellent intelligibility. For mobile use, it can be operated with the shoulder strap and the handgrip. In case of fixed use, it can be mounted on a stand with an optional adaptor or simply placed on a flat surface. The PTT microphone is detachable and can be unplugged for replacement. ER-67S includes a siren function.
Features
ER-68S is the most powerful megaphone of the range with 45W output. Featuring up to 2200 meters range those models have excellent intelligibility and consistent coverage. It can be operated with a shoulder strap for pedestrian applications. In the case of a fixed position, it can be mounted on a stand with an optional adaptor or simply placed on a flat surface. The PTT microphone is detachable and can be unplugged for replacement or wireless use. A siren function is available for warning applications.
Features
ER-68 and ERV-68 are the most powerful megaphones of the range with 45W output. Featuring up to 2200 meters range those models have excellent intelligibility and consistent coverage. They can be operated with the shoulder strap for pedestrian applications. In case of a fixed position, they can be mounted on a stand with an optional adaptor or simply placed
on a flat surface. ERV-68 is equipped with a VHF receiver module for wireless applications. The PTT microphone is detachable and can be unplugged for replacement or wireless use.
Features
MODEL: ER-68
MODEL: ERV-68
The ER-1215S is a hand grip type, 15 W output megaphone with a siren. Pressing the siren button sounds a siren continuously in emergency conditions. The newly developed polyimide diaphragm is employed to ensure high sound quality.