The gray Toa Electronics ER-2930W is a shoulder-held megaphone designed to provide reliable voice and music amplification for indoor and outdoor public address scenarios. With multiple input jacks and a built-in UHF/VHF wireless microphone receiver, it easily accommodates a variety of external sources. 30W of rated output power provide a maximum range of approximately 2624 feet for voice projection, or up to 3280 feet for the switchable whistle tone. This megaphone incorporates an anti-bacterial treatment to ensure safe usage when passed from person to person.The ER-2930W features a durable housing with integrated shoulder support, a convenient carrying strap, and a detachable microphone with a coiled cable. Hook up an external dynamic mic to the 1/4" input, and connect a mobile device to the 3.5mm input for convenient music streaming. The ER-2930W can be powered by ten D batteries (available separately) for up to 17 hours. Alternatively, power it via an external 12V battery for extended periods of use.