PSD-S AE SM2-7 105DB/1 Series Base Mount Siren, 24 V, 105dB at 1 m, IP65, DC, 2-Tone

The Phoenix Contact Acoustic element is an audible signal element is designed as a component of a modular signal tower. According to your requirements, a signal tower may comprise any combination of up to five signal elements. You may use up to five optical signal elements or up to four optical and one audible signal element. Only use an audible signal element as the top element.

Multi tone siren signalling depending on the situation
Two tone functions can be selected via DIP switches
Adjustable volume
Minimum volume of 95 dB