TOA BS-680FC Loudspeaker in metal enclosure. Power Supply The Wireless Exit Stopper is

The Wireless Exit Stopper is a unique and highly effective way to alert you to any unauthorised exits or entries through emergency exit doors

Can make up to 7 levels of call - Standard

The classes are identified by the letters A to G (Class 1 is subdivided into A1 and A2)

This is a brand new  old stock item item

the Sonos Sounder has universal acceptance

TOA BS-680FC Loudspeaker in metal enclosure. Power Supply The Wireless Exit Stopper isConstructed with metal cabinet, the speaker is ideal for use in a voice alarm system. Can be surface or flush mounted to the wall. Either concealed in wall wiring or exposed wiring can be used for speaker cable connection. The speaker structure of direct wall mounting with screws prevents the speaker from falling easily even if an outward force is applied to. The input impedance can be easily changed by changing the tap position of the transformer.