The ER-1215 is an easy-to-operate, hand grip type megaphone rated at 15 W of output. The newly developed polyimide diaphragm is employed to ensure high sound quality. Specification Power Source R14P (C) × 6 (9 V DC) Rated Output 15 W Maximum Output 23 W Battery Life Approx. 14 hours (JEITA)* Audible Range Approx. 315 m (JEITA)* Diaphragm Polyimide film (voice coil, bobbin) Operating Temperature -10 to +40 Finish Horn: ABS resin, light gray Mouth, battery case and handle: ABS resin, gray Strap: Nylon, black Dimensions 210 (W) × 291 (H) × 346 (D) mm Weight 1.1 kg (without batteries) *JEITA: Japan electronics and information technology industries association.