Description The ER-2930W is a shoulder megaphone having facilities of EXT. mic input, an AUX input, a DC power input, a battery meter whistle sound. It can be mounted to the optional ST-16A speaker stand. Handle and microphone with anti-bacteria treatment improve hygiene and safety during use. Its microphone assembly are given germ-resistant treatment. The newly developed polyimide diaphragm is employed to ensure high sound quality. Specification (*1) 0 dB = 1 V Power Source Battery: R20P (D) × 10 (15 V DC)External Power: 12 V DC Battery Rated Output 30 W Maximum Output 45 W Signal Sound Whistle (1.6 to 2.4 kHz) Battery Life Voice: Approx. 17 hours (JEITA (*2)), Whistle: Approx. 90 min. (JEITA (*2)) Audible Range Voice: Approx. 800 m (JEITA (*2)), Whistle: Approx. 1000 m (JEITA (*2)) AUX Input Sensitivity -10 dB (*1) (300 mV), 10 kΩ (φ3.5 mini jack, stereo plug acceptable) ,volume control EXT. Mic Input 600 Ω, unbalanced, φ6.3 phone jack, volume control Receiving Frequency UHF (800 MHz Band), VHF (200 MHz Band) Antenna Fold-down flexible antenna Diaphragm Polyimide film (voice coil, bobbin) Anti-bacteria Treatment Microphone Remaining Battery Indication LED (also serves as a power indicator)Steady ON: Normal use, Flashing: Batteries need replacement Operating Temperature -10 ℃ to +40 ℃ Finish Horn ring: Vinyl chloride, grayHorn: Aluminum, light gray, paintCase top: Die-cast aluminum, gray, paintStrap: Nylon, black, Others: ABS resin, gray Dimensions φ351 × 512 mm Weight 3.8 kg (without batteries) , Microphone: 150 g Accessory φ3.5 mini plug (AUX input)…1, External power supply cord (1 m)…1,Splash-proof cover…1 (*3) Option Speaker stand: ST-16A, Microphone: DM seriesWireless microphone: WM-3220 series, WM-3310 series, WM-4200 series, WM-4300 seriesWireless tuner: WTU-3800 series, WTU-4800 series