Vibration transducer SEL SP-157VP electromagnetic type in a sealed case.
For installation, use standard fasteners: 1) On enclosing structures (walls, etc.) - anchor SP-157AC. 2) On surfaces (window openings, including glazing, etc.) - disk SP 157DM. 3) On pipes - profile clamp SP-157PM. 4) On the frame and glass - combined "frame".
If necessary, it is equipped with an external power regulator SEL SP-157P (under a screwdriver)
Technical specifications: Band of emitted frequencies of the noise signal from 90 Hz to 11.2 kHz Resistance 12 Ohm Emitted power max. 85 dB External radiation level adjustment LED operation indicator Overall dimensions d40x35 mm Weight 50 g