If you use a megaphone often, our 25W megaphones are professional grade with a built in amplifier and designed for constant use outdoors with a range of around 1km. They also have a siren setting. This is a great loud hailer but we don’t recommend it for indoor use.
8 x C-size batteries are needed for power but it comes with a car charger and 5m cable as a backup. If you prefer, we also have a 25W megaphone with hand held microphone