The present invention relates to secure paring of electronically controlled devices adapted to communicate with each other. The invention provides a system comprising a local (200) unit and a remote (100) unit. The local unit comprises a local transmitter (270), a local receiver (280), a local sensor (290), and a local processor (210) connected to the local transmitter, the local receiver and the local sensor. The remote unit comprises a remote transmitter (170) adapted to transmit information to the local receiver (180), a remote receiver adapted for receiving information from the local transmitter, a remote sensor (190), and a remote processor (110) connected to the remote transmitter, the remote receiver and the remote sensor. The local sensor and the remote sensor are adapted to detect that the units have been arranged in a mating relationship with each other at a given point in time, this allowing the units to exchange information based upon that time.