DWGK-11 from Bircher Reglomat, a Swiss manufacturer specializing in safety systems for automatic doors and industrial access:

Technical Specifications

• Model: DWGK-11
• Type: Pressure Wave Switch
• Function: Converts air pressure pulses into electrical signals
• Contact Type: Normally Closed (NC)
• Response Pressure: 2 to 150 mbar
• Operating Voltage:
  • AC: 24–250 V
  • DC: 24–50 V
• Switching Current: 20 mA to 500 mA (resistive load)
• Housing: Impact-resistant plastic (IP54 rated)
• Dimensions: Approx. 76 × 45 × 55 mm
• Weight: 0.10 kg
• Connection Terminals: 6.3 mm plug tabs
• Mounting: Surface or clip-on
• Membrane Material: Silicone
• Application Category: Industrial safety systems