Command attention with these durable long-range megaphones. Adjustable volume control allows you to make announcements without overdoing it. Siren function is vital for emergencies. Convenient wrist strap makes it easy to transport. Battery operated for ease of use on-the-go batteries not included. Adjustable 12 to 25 Watts. Audio Range: 1000 yards Length: 9 1/2 Power: 25 W Power Sources: 8 C Batteries sold separately.