But, this heavy duty 25W megaphone is a strong, professional grade model with a built-in amplifier that will project sound to 1km distance (in clear conditions). If you are likely to use your loud hailer more often or the ambient noise levels are higher, this is the one for you.
It has a siren switch and a carrying strap and takes 8 x C-size batteries (see options below). The build is solid and superior and with its car charger lead and 12V jack, it has two alternatives to the batteries.
Suitable for professional use in large open spaces and where more durability is required