Small in size and light in weight, the ER-520 megaphone can be easily carried by a single hand. The newly developed polyimide diaphragm is employed to ensure high sound quality. Rated Output: 6 W (10 W maximum). Power Source: R6P (AA) × 8 (12 V DC). Battery Life: Approx. 10 hours. Audible Range (City areas): Approx. 250 m. Finish: light gray ABS. Dimensions: 160 x 256 x 260 mm. Weight: 620 g.