Charge up AmpliVox model 600R series megaphone and go anywhere you need to extend your voice in large open spaces. It is ideal for crowd control, announcements in noisy environments, or emergency services. It is also a good fit for smaller audiences or where less range is needed. Makes it easy to be heard loud and clear. Mini-Meg also has a siren with an adjustable volume. Fold Mini-Megs handle for easy carrying and storage. Meg is powered by either conventional batteries or a rechargeable lithium ion battery (Not Included) that can be reused hundreds of times. You can switch battery type anytime so you are never out of power.