A key equipped with an electronic chip and an antenna embedded inside the key thickness. Keys can be credit-card shaped or key-ring shaped. One of the features of proximity key/reader pairs is the key reading distance, which depends on the installation and, more rarely, on the level of ambient electromagnetic noise. Technically-speaking, the key reader emits an electromagnetic wave through space to query one or several remote receivers or a key. Three types of key exist: passive, active or semi-passive. These different types are differentiated by the way the receiver is powered.
Customise your choices according to the different purposes explained below. We will keep your choices for 6 months, then we will ask you the question again. You can change your mind at any time by using the "Manage my cookies" link at the bottom of each page. The “technical" tracers are essential for the operation of the site and therefore cannot be deactivated. To find out more, see our personal data management policy.