Bluetooth® AirVox PA System The AmpliVox AirVox Mobile PA System is the ideal battery powered, all-in-one wireless compact portable PA solution with Bluetooth® connectivity. Perfect for voice and music in an indoor or outdoor environment. The wide dispersion speaker produces big sound and well-balanced audio suitable for any situation. Built-in Bluetooth® module allows you to wirelessly stream sound from any Bluetooth® capable device. The system includes an AC power-cord for continuous operation when connected to a standard AC wall-outlet, and facilitates charging the included internal sealed lead acid (SLA) batteries. On a full charge, the system will operate up to ten hours on its SLA batteries' power. During emergencies, the battery powered design sets up quickly and allows you to broadcast emergency information even during power outages.