Shoulder megaphone rated at 15 W of output (maximum 23 W). The ER-2215W comes with a whistle and has a separate microphone. It can be mounted to the optional ST-16A speaker stand. The newly developed polyimide diaphragm is employed to ensure high sound quality. Power Source: 6 R14P (C) batteries. Its battery life is 9 hours (with 20 minutes of whistle). Finish: gray ABS. Dimensions: 210 (diameter) x 336 mm. Weight: 1,2 kg + 150 g (microphone).