Werma Siren Element Is Best Used For Areas With Changing Ambient Sound Levels. Werma Siren Element has an automatic sound output adjustment between 80 and 100 dB to provide optimum performance in changing audio environments. Available types include Siren Element, Siren Element Alternating and Siren Self-Adjusting. Current consumptions are 25 Ma, 70 Ma, Max 40 Ma, Max 80 Ma and Max 150 Ma. Protection ratings are IP65 and IP40. Voltages vary per model.