The Plena All-in-One System is a six-zone 240 W background music and paging system, which consists of the Plena All-in-One Unit, an optional remote Wall Panel, and one or more Call Stations.The Plena All-in-One Unit can provide hours of uninterrupted music from USB or SD flash memory. The Plena All-in-One Unit can provide hours of uninterrupted music from USB or SD flash memory. One or more Call Stations for six-zones and all-call, so that calls can be made to any combination of zones or all zones. It is a costeffective public address system for small to mediumsized venues that require an easy-to-use out-of-the-box solution.