Small in size and light in weight, the ER-520S megaphone can be easily carried by a single hand. It can also provide a siren tone. The newly developed polyimide diaphragm is employed to ensure high sound quality. Rated Output: 6 W RMS (maximum 10 W). Signal Sound: Siren. Battery Life; Voice: Approx. 10 hours (Siren: Approx. 40 minutes). Audible Range (City areas); Voice: Approx. 250 m (Siren: Approx. 315 m). Finish: red ABS. Dimensions: 160 x 256 x 260 mm. Weight: 650 g.