CD 470 Offers reliable monitoring against attacks with mechanical tools. The CD 470 is a chock- and vibration sensor with 3 separate detection channels an integration channel / saw channel for weak signals with long duration, a counting channel that senses strong impact on the monitored surface and an explosion channel which senses very strong signals from e.g. an explosion.CD 470 shares design with CD 475 but has built-in relays for the alarm and tamper outputs. This allows the CD 470 to be connected directly to the alarm central unit, this means that no analyser unit is necessary. CD 470 polarity independent, just like CD 475.