Description Small in size and light in weight, the ER-520 megaphone can be easily carried by a single hand. Handle and microphone with anti-bacteria treatment improve hygiene and safety during use. The newly developed polyimide diaphragm is employed to ensure high sound quality. Specification Power Source R6P (AA) × 8 (12 V DC) Rated Output 6 W Maximum Output 10 W Battery Life Approx. 10 hours (JEITA)* Audible Range (City areas) Approx. 250 m (JEITA)* Diaphragm Polyimide film Anti-bacteria Treatment Mouth and handle Operating Temperature -10℃ to +40℃ Finish Horn: ABS resin, light grayStrap: Tetoron, blackHandle, mouth and others: ABS resin, gray Weight 620 g (without batteries) Dimensions 160 (W) × 256 (H) × 260 (D) mm Note: Batteries are optional.* JEITA: Japan electronics and information technology industries association. (EIAJ TT-4501A)