These cards, when switched on, communicate everything is safe with the vehicle and movement is authorised. If switched off or not present the tracking device will alert our Secure Control Centre who will contact our customer immediately. The cards are designed to be the same size as a credit card, allowing for safe storage in a purse or wallet. All S5 devices are monitored by the Global Telemetrics 24/7 365 days a year Secure Control Centre with an alert service for the following instances: battery tamper or disconnection, movement slert, Driver Detection not present, and alarm sounding (if connected to the tracking device).