For "Fault Tolerant" CAN Systems - keep the keyless entry remote controls that came with the vehicle and add state of the art anti-theft security protection against thieves and vandals. These systems are ideal for new car purchasers who want to protect their vehicle investment with a state-of-the-art security system while retaining the remote controls that came with the vehicle. All CANBUS OEM Security Upgrade Systems feature the famous Stinger DoubleGuard shock sensor, which detects and differentiates between light impacts and actual intrusion attempts, which trigger the powerful Revenger 6-Tone Siren.