The ER-2215S is a shoulder megaphone rated at 15 W of output. The ER-2215S comes with a siren 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 : Battery R14P (SUM-2), Size "C"× 6 (9 V DC) Rated Output : 15 W Maximum Output : 23 W Battery Life : Voice: Approx. 9 hours (JEITA)*, : Siren: Approx. 20 minutes (JEITA)* Siren Sound : Siren (sounds at 5 seconds intervals) Audible Range : Voice: Approx. 400 m (JEITA)* : Siren: Approx. 500 m (JEITA)* Diaphragm : Polyimide film (voice coil, bobbin) Operating Temperature : -10 ℃ to +40 ℃ Finish :- Horn: ABS resin, red Microphone and other: ABS resin, red Strap: Nylon, black Dimensions : Φ210 × 336 mm Weight :- Body: 1.2 kg (without microphone and batteries) Microphone: 150 g Option : Speaker stand: ST-16A