Sonos Pulse wall mounted Visual Alarm Devices are available as fire beacons or combined sounder beacons. **WhSonos Pulse wall mounted Visual Alarm Devices are available as fire beacons or combined sounder beacons. With an EN54-23 approved coverage pattern of W-2.4-7.5, each Sonos Pulse wall mounted device can be mounted up to 2.4m high and can cover a 7.5m x 7.5m square room with a single device.ite flash: EN54-23 coverage W-3.1-11.3 **Red flash: EN54-23 coverage W-2.4-7.5