Made In USA 5551B-2W Adaptatone Cone Speaker Fire Protective Signaling Speaker P-038347-0085:: 70V RMS Sound Pressure Level At 10 Feet (3.05m) In A Reverberant Room Using 400-4,000Hz Band Limited Pink Noise Per UL 1480. .25W 81 dBA .5W 84 dBA 1.0W 87 dBA 2.0W 90 dBA