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LockCar IS357 intelligent immobiliser review, the micro device that combines tag, app and relay break
The LockCar IS357 is an intelligent micro immobiliser combining a hardwired relay break, wireless tag ID authentication, and mobile app control in a single compact device. It is one of the smallest and most discreet security devices in the LockCar range, and it works on any vehicle from a bicycle to a 24V commercial truck. This review covers its specification, ideal applications, and comparison with the IC3ST.
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The LockCar IS357 is an intelligent micro immobiliser combining a hardwired relay break, wireless tag ID authentication, and mobile app control in a single compact device. It is one of the smallest and most discreet security devices in the LockCar range, and it works on any vehicle from a bicycle to a 24V commercial truck. This review covers its specification, ideal applications, and comparison with the IC3ST.
IS357 technical specification and design
The IS357 is classified as an intelligent micro device because of its compact form factor and the integration of three functions within a single small housing. The relay break function uses the same principle as all LockCar immobilisers: a physical relay in the start circuit that requires authenticated signals to close. The wireless tag ID uses short-range radio communication to detect the presence of the paired tag. The mobile app provides remote status monitoring and backup authentication.
The micro form factor is a significant advantage in installations where space is constrained. The IS357 can be fitted in locations where larger units would not fit, and its small physical footprint reduces the possibility of detection during a casual inspection of the vehicle interior. For owners who place a high value on installation invisibility, the IS357 provides maximum discretion.
12V and 24V support makes the IS357 applicable to the same broad range of vehicles as the IC3ST, including cars, vans, pickups, motorcycles, motorhomes, agricultural vehicles, and specialist transport. The combination of its small size and wide voltage range makes it one of LockCar’s most versatile products.
IS357 compared to the IC3ST
Both the IS357 and IC3ST are standalone dual-factor immobilisers that require no separate MCU. The primary difference is form factor and authentication method detail. The IC3ST uses a 2.4GHz encrypted proximity tag with AES-128 encryption communicating over a dedicated channel. The IS357 uses a wireless tag ID system with mobile app integration. Both provide two-factor protection; the specific technical implementation differs.
The IS357 may be preferred by owners who use their smartphone as the primary control interface and want the tag ID as a seamless secondary factor rather than the primary hands-free authenticator. The IC3ST’s hands-free approach, where the tag automatically disarms on approach, is the most transparent daily-use experience. The IS357 suits owners who prefer slightly more active control over the disarm process.
How LockCar stops this threat
LockCar installs a hardwired relay break in the vehicle start circuit. This break is positioned downstream of the factory immobiliser, the OBD port, and the CAN bus. Even after a successful relay attack or CAN bus injection, the engine will not start because the LockCar relay is open. Closing it requires a second, independent encrypted authentication that relay equipment cannot replicate. LockCar is designed and manufactured in the United Kingdom and installed by mobile engineers at your location.
LockCar recommended products
How long does LockCar installation take?
Installation typically takes 60 to 90 minutes. Our mobile engineer brings all parts and equipment to your location. The system is fully tested before the engineer leaves and you receive documentation on the same day.
Will LockCar interfere with my vehicle factory electronics?
No. LockCar installation uses vehicle-specific wiring procedures and connects at the start circuit in a way that is invisible to the factory CAN bus, ECU, and all other electronic systems. All factory functions continue exactly as before.
Does LockCar cover my area?
LockCar mobile service covers the entire UK. Same-day and next-day appointments are available in most areas. WhatsApp or call Victor to confirm availability and book at your preferred location.
Can I get insurance documentation after fitting LockCar?
Yes. Every LockCar installation comes with a full certificate including device serial number, installation date, vehicle registration, and a technical description of the relay break mechanism. This is accepted by the majority of UK insurers for discount applications.
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