The present invention relates to system for raising an alarm if an electronic device is stolen. The tamper alert system for an electronic device comprises: a cable with a plug for connecting to a terminal of the device which has a processor; a sensor that is operable to communicate with the processor in the device and in accordance with computer implemented software.
When an authorised connection of the cable is made to the electrical device a signal is received by the processor which configures an alarm to a standby mode. When in standby mode, if the sensor senses an unauthorised disconnection of the cable from the device, the processor transmits an alert signal, indicating an unauthorised event, to the alarm which activates the alarm.