Portable amplified high power megaphone (30W). This unit is supplied with a wired microphone (anti feedback on induced coil with on/off switch, with volume control and Siren/Alarm ) in order to allow both hand held and shoulder belt operation. The latter is comfortable for long lasting operation (the belt is supplied). Powered by 8 C type batteries (not included) or External Power Supply DC 12V 2A. Speaking time 15 hours (not continous use) and audible range: 800m - 2 Km. The special ABS manufacturing makes this unit really rugged, allowing use in the worst environmental and atmospheric conditions