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Industry-standard systems
Free installation by trained fitters
0% finance options available
3-year warranty as standard
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A reliable Cat 2-1 car security alarm system that strengthens your vehicle’s everyday protection with smart, seamless operation and trusted Cobra engineering.
Vehicle Compatibility
Product Features
- Upgrades factory-remote/keyless vehicles to full Thatcham Cat 2-1 protection with certified Cobra reliability.
- High Security Disarm ensures the system only unlocks when a recognised ADR card is detected – even if thieves steal your keys.
- Built-in tilt sensor and ultrasonic cabin sensors detect jacking, towing, glass-break or movement inside the vehicle.
- Pre-disarm safety sequence checks for a valid ADR card; if not detected, a full alarm triggers automatically.
- Self-powered siren, flashing hazards and immobiliser cuts activate immediately if an unauthorised unlock is attempted.
- CAN-bus compatible for modern vehicles, with optional microwave sensor available for vans and load areas.
Free UK-Based Installation
25% OFF on Workshop Installation
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About the Cobra Car Alarm & Immobiliser – 4822 – Cat 2-1
The Cobra 4822 is a Thatcham Category 2-1 upgrade alarm and immobiliser that delivers high-grade vehicle protection with modern ADR driver-recognition. When your vehicle is unlocked with the factory remote, the system enters a timed pre-disarm stage, checking for the presence of your encrypted ADR card. If no valid card is detected within 30 seconds, the system triggers a full alarm cycle – sounding the battery-backed siren, flashing the hazard lights and activating immobiliser cuts. Built-in ultrasonic sensors protect the cabin, while the integrated tilt sensor detects jacking, towing or wheel theft. With CAN-bus integration, optional microwave sensors for vans and a PIN override via LED panel, the Cobra 4822 is a powerful, reliable defence against key theft, relay attacks and forced entry.
Features of Cobra 4822 Alarm
High Security ADR Disarm
Only unlocks and disarms when a valid ADR card is detected – preventing key theft and relay-attack access.
Pre-Disarm Safety Sequence
When the factory remote unlocks the car, the system checks for a valid ADR card; if not found within the timed window, a full alarm triggers.
Built-in tilt Sensor
Detects lifting, wheel theft, towing or jacking attempts instantly.
Dual Ultrasonic Interior Sensors
Monitors cabin movement and glass-break vibrations.
Optional Microwave Sensor (Vans)
Adds load-area or cargo protection for commercial vehicles.
Battery-Backup Siren & Hazard Activation
Siren continues to sound even if the main battery is cut; hazards flash during full alarm cycles.
PIN Override via LED Panel
Allows disarm/override using your unique PIN code if an ADR card is lost.
CAN-bus Compatibility
Ensures seamless integration with modern vehicle electronics.
Free UK-based Installation
Every Mass Vehicle Security product includes free, professional installation – with no hidden fees or subcontractors.
Our core team operates across the Midlands and Yorkshire, and we also partner with a trusted network of vetted installers to cover the rest of the UK. We aim to get your product fitted within 5 working days of purchase, depending on availability.
We install at homes, workplaces, residential streets and private driveways – anywhere with safe, accessible parking.
FAQs about Cobra 4822 Alarm
What does “Thatcham Category 2-1 upgrade” mean?
It means the Cobra 4822 upgrades a vehicle that already has a factory immobiliser (Cat 2) into a full alarm + immobiliser system (Cat 1 equivalent). This brings your vehicle up to a higher, insurance-approved level of protection.
Do I still use my factory key or remote?
Yes. The Cobra 4822 is designed to work seamlessly with your existing key fob or keyless entry. You lock and unlock the car normally, and the alarm arms/disarms automatically.
What are ADR driver-recognition cards?
They are encrypted driver ID cards included with the system. The vehicle will only disarm and allow starting if a recognised ADR card is present, preventing key theft, cloning and relay-attack starts.
Does the system protect the interior of the car?
Yes. The Cobra 4822 uses ultrasonic interior sensors to detect movement inside the cabin, protecting against glass break, door forcing or window entry.
Will the alarm still sound if thieves disconnect the battery?
Yes. The system has a self-powered battery-backup siren that continues to operate even if the main vehicle battery is disconnected or tampered with.
Does it protect the bonnet, boot and doors?
Absolutely. The system monitors all major entry points – doors, boot and bonnet – and triggers the siren immediately if any are opened illegally or forced.
Is the Cobra 4822 compatible with modern CAN-bus vehicles?
Yes. The 4822 is designed to interface with many CAN-bus systems, making installation clean, reliable and compatible with the electronics of most modern cars and vans.
Does it immobilise the car if someone tries to start it without an ADR card?
Yes. The system includes immobiliser cuts that stop the engine from starting unless an authorised driver-recognition card is detected, even if thieves have your keys.
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Get in touch
Still have a question about Cobra 4822 Alarm. Drop us a message and we’ll get back to you as soon as we can (usually within one working day).