Ruupor Velleman MP25SFM

Number of batteries 8
Battery IEC size C (LR14, R14, HR14, KR14, ZR14 ,14A, 14D, UM2,
Maximum sound level 92 dB
Volume control
Megaphone functions Siren, Voice, Whistle
Maximum audible distance 500 m
Diameter unit 230 mm
Depth unit 345 mm
Weight unit 1300 g

https://www.velleman.eu/products/view/power-megaphone-25w-mp25sfm/?id=377978&lang=en