HamiltonBuhl Megaphone The HamiltonBuhl MM-3 Mighty Mic Megaphone projects your voice with exceptional clarity. Lightweight compact and ruggedly constructed it resists impact and outdoor conditions. Special features include an external wired microphone built-in siren and a voice recording loop allowing you to record up to a 10 second message and loop playback indefinitely. The MM-3 Megaphone (Bullhorn) offers a compelling combination of power and exceptional value!