15-watt industry standard paging horns certified by Underwriters Labs Under Standard 1480.

Emergency Horn Loudspeaker with 15-Watt 25V/70V Transformer
AP-15TU
Emergency Horn Loudspeaker with 15-Watt 25V/70V Transformer Meets Buy America Requirements
AP-15TU-USA
Emergency Signaling Horn Loudpeaker with 15-Watt 25V/70V Transformer and Line Supervision Capability
AP-15TUC
Emergency Horn Loudspeaker with 15-Watt 25V/70.7V Transformer and Line Supervision Capability - Red
AP-15TUCR
Flanged Emergency Horn Loudspeaker with 15-Watt 25V/70V Transformer
APF-15TU
Flanged Emergency Horn Loudspeaker with 15-Watt 25V/70V Transformer Meets Buy America Requirements
APF-15TU-USA
Flanged Emergency Horn Loudspeaker with 15-Watt 25V/70V Transformer and Line Supervision Capability
APF-15TUC