Sone040: __link__

Available in DC (10-30V) and AC (115V, 230V) versions.

To give you the most relevant information, could you tell me: sone040

One of the most functional features is its "remotely selectable" second stage. This allows users to switch between two different tones using a single device, which is vital for distinguishing between a "warning" and an "evacuation" signal. Ease of Installation Available in DC (10-30V) and AC (115V, 230V) versions

Are you comparing this against a (like a Federal Signal or Werma model)? sone040