Pistol grip megaphone with wrist strap, just face your audience, hold the megaphone up to your mouth, squeeze the trigger and speak Siren function for alerting and attracting attention Removable rechargeable Li-ion battery included Volume controller This 10 watt megaphone will ...Pistol grip megaphone with wrist strap, just face your audience, hold the megaphone up to your mouth, squeeze the trigger and speak Siren function for alerting and attracting attention Removable rechargeable Li-ion battery included Volume controller This 10 watt megaphone will amplify your voice and can also make other noises for getting peoples' attention, they are portable and lightweight and are ideal for fire wardens and marshalls to raise alarms or effectively communicate with groups of people. Easy to use, with push button operation and volume control they will save you shouting and making yourself a little hoarse.