Addressable Fire Detection / Sounders and Beacons Sounders and Beacons The ST-ARL is a loop-powered Addressable Remote Indicator, with high-intensity LEDs and a Fresnel lens design which produces a highly visible signal. ST-ARL Model ST-AWSF-RWL is an addressable loop powered Wall Sounder Beacon innovatively designed to provide a range of tones and volumes with a maximum output of up to 102dB(A) (±2dB(A)) with low current consumption. ST-AWSF-RWL Model ST-AWS-R is an addressable loop powered Wall Sounder innovatively designed to provide a range of tones and volumes with a maximum output of up to 102dB(A) (±2dB(A)) with low current consumption. ST-AWS-R