In the ever-evolving world of automotive safety, car alarms have become a fundamental feature for vehicle owners aiming to protect their prized possessions. With the myriad of options available, selecting the best car alarm system can be daunting. 

Fortunately, customer reviews can shed light on real-world performance, ease of installation, and overall reliability of these systems. Themes that consistently emerge from user feedback include the importance of straightforward operation, the effectiveness of theft-deterrent features, and the value for money provided by the system. 

To aid you in making an informed decision, we’ve compiled a ‘Top 5’ list of the best car alarms, complete with pros and cons, drawing from extensive reviews and our own experience at Axioma. 

Our technicians recently showcased these products, vouching for their effectiveness. So, whether you’re looking to upgrade your existing setup or install a new one, here’s the rundown from worst to best, ensuring your car stays safe and sound.

4. Technaxx Alarm System for Cars

Technaxx Alarm System

The Technaxx Alarm System offers a diverse set of features, including a PIR motion sensor and an external 105 dB siren, which can be quite effective in alerting in case of unauthorized access. Buy here.

However, some reviews indicate that there’s room for improvement with regard to false alarms and battery life. If you’re looking to further enhance your car’s security, consider exploring articles like ‘Best Faraday Pouches‘ to protect against keyless entry theft and ‘Why does my car alarm go off?‘ to troubleshoot unexpected activations of your car alarm system.

Rating: 2.9/5 (96 Ratings)


Includes PIR motion sensor

High-decibel siren for alerting

Compatible with cars, vans, and homes

Price: £41.68


Issues with false alarms reported

Limited battery life

Mixed reviews on sensitivity and reliability

3. Universal Car Alarm System

Universal Car Alarm System

The Universal Car Alarm System offers basic protection with its immobilizer kit and wireless functionality. The system includes two remote controls for convenience. However, customer reviews have pointed out issues with the system’s reliability and the complexity of the installation process, which might require professional help for those who are not technically inclined. Despite its affordable price, the performance of this car alarm system seems to fall short of expectations for some users. Buy here.

Rating: 3.4/5 (190 Ratings)


Wireless system for easier setup

Comes with an immobilizer kit

Two remote controls included

Price: £31.89


Installation can be complex

Questionable long-term reliability

Some reports of inadequate instructions

2. Car Horn Siren Alarm

Car Horn Siren Alarm

The Car Horn Siren Alarm stands out with its 7-level sensitivity feature, which allows for customization according to your preferences. It’s designed for 12v devices and boasts a non-destructive installation process, meaning you won’t have to worry about damaging your vehicle during setup. Although this system has received positive marks for its ease of use, some users have noted that the alarm could be more durable. This product is suitable for car owners looking for a straightforward and adjustable alarm system.

Rating: 4.0/5 (9 Ratings)


Adjustable sensitivity levels

Easy to install without vehicle damage

Suitable for all 12v vehicles

Price: £7.00


Limited number of reviews for a comprehensive assessment

Some concerns about the product’s durability

1. CARLOCK Anti Theft Car Device

CARLOCK Anti Theft Car Device

The CARLOCK Anti Theft Car Device is more than just a car alarm; it’s a real-time tracker that provides instant alerts on your smartphone if unusual activity is detected. It plugs directly into the OBD port of your vehicle, making installation a breeze. With high ratings and a multitude of positive reviews, the CARLOCK system is celebrated for its advanced technology and reliable performance. It’s a top-notch choice for those who want to combine security with smart features. Buy here.

Rating: 4.3/5 (4,190 Ratings)


Real-time tracking and alerts through a smartphone app

Easy OBD port installation

High customer satisfaction and positive reviews

Price: £39.90


Requires a subscription for full features

May not be compatible with all vehicles

Dependent on cellular network coverage for real-time updates

Choosing the best car alarm system is a critical decision for ensuring the safety of your vehicle. From the Technaxx Alarm System to the top-rated CARLOCK Anti Theft Car Device, each product has its unique features and potential drawbacks. When considering a car alarm, it’s crucial to weigh the pros and cons and select a system that aligns with your specific security needs and vehicle compatibility.

Additionally, car care extends beyond security measures. For those looking to maintain their car’s aesthetic, addressing issues like paint scratches is essential. Be sure to check out our tips on paint scratch repair to keep your car looking its best.

If you’ve found our reviews helpful, we invite you to visit the rest of our blog for more insightful articles on car care and maintenance. And, should you find yourself in need of any auto repairs or advice, don’t hesitate to get in touch with us for a free quote. Your vehicle’s security and appearance are our top priority at Axioma, and we’re here to help you keep it in pristine condition.

Maxwell Harrington is a renowned expert in aesthetic car repair, known for his innovative work at Axioma, where he combines art and advanced technology in SMART car repairs. His expertise in custom paint jobs, body modifications, and use of digital tools for vehicle restoration has made him a pioneer in blending automotive design with state-of-the-art repair techniques.