Megaphone TOA ZR510S Original Power Source R6P (AA) 8 (12 V DC) Rated Output 6 W Maximum Output 10 W Signal Sound Siren Battery Life Voice: Approx. 10 hours (JEITA)* Siren: Approx. 40 minutes (JEITA)* Audible Range (City areas) Voice: Approx. 250 m (JEITA)* Siren: Approx. 315 m (JEITA)* Diaphragm Polyimide film Anti-bacteria Treatment Mouth and handle Operating Temperature -10 to +40 Finish Horn, mouth and handle: ABS resin, red Strap: Tetoron, black Weight 650 g (without batteries) Dimensions 160 (W) 256 (H) 260 (D) mm