3998 Compact Thatcham Category 2-1 Upgrade alarm A compact remote control alarm and immobiliser that is insurance approved to Thatcham Category 2-1 status. Offers protection to doors, boot and bonnet. With ultrasonic protection for the vehicle interior and battery back-up siren. Also offers automatic door locking and anti-hijack facility. Protection to doors, boot and bonnet Ultrasonic sensors Input for additional / optional sensors Panic facility-personal attack warning Universal central door locking output Vehicle Immobilisation Visual arm and disarm indication Single push button type keypad override Battery back-up siren Upgrades Thatcham Cat 2 Immobiliser to Thatcham Cat 1 Alarm / Immobiliser