The ER-1215S is a hand grip type, 15 W output megaphone with a siren. Pressing the siren button sounds a siren continuously in emergency conditions. 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 Signal Sound Siren (sounds at 5 seconds intervals) Battery Life Voice: Approx. 14 hours (JEITA)* Siren: Approx. 20 minutes (JEITA)* Audible Range Voice: Approx. 315 m (JEITA)* Siren: Approx. 500 m (JEITA)* Diaphragm Polyimide film (voice coil, bobbin) Operating Temperature -10 to +40 Finish Horn, mouth, battery case and handle: ABS resin, red Strap: Nylon, black Dimensions 210 (W) × 291 (H) × 346 (D) mm Weight 1.2 kg (without batteries) *JEITA: Japan electronics and information technology industries association.