Discovery 3 and 4 Security products
The Discovery 3 and 4 jumped up in tech, as such require some slightly different product to the defender and Discovery 1/2
Discovery three (TDV6)
Going more high tech security of these vehicles requires a bit more thought OBD Security is a must, along with a tracker... It is a good idea to use an RFID wallet that will protect the key from having its signal replicated and boosted.