| Thatcham alarm car categories are C1 for alarm and | | | | designed to integrate with an existing L2 immobiliser. |
| immobiliser and category C2 to 1 for alarm upgrade | | | | Thatcham alarms for motorhome have additional |
| designed to integrate with an existing C2 immobiliser. | | | | inputs for sensors such as; PIR to protect the interior |
| Soft top cars should be fitted with a microwave | | | | with separate ultrasonic sensor in the cab, bike and |
| sensor rather than an ultrasonic sensor to protect the | | | | gas bottles loops, locker, door and window |
| interior when the top is down. Some of the best | | | | sensors.Motorcycle Thatcham alarm categories are |
| known Thatcham alarms for cars are from Avital, | | | | MC1 for alarm and immobiliser and category MC2 to 1 |
| Clifford, Cobra, Gemini, GT, Toad and ViperVan and | | | | for alarm upgrade designed to integrate with an |
| Light Commercial Vehicles Thatcham alarm categories | | | | existing MC2 immobiliser. Thatcham alarms for motor |
| are; L1 for alarm and immobiliser and category L2 to 1 | | | | bikes are more compact with better waterproofing |
| for alarm upgrade designed to integrate with an | | | | than car or van alarmsHGV Thatcham alarm Heavy |
| existing L2 immobiliser. Thatcham alarms for vans may | | | | Goods Vehicles categories are H1 for alarm and |
| require additional doors sensors to be fitted in the | | | | immobiliser and category H2 to 1 for alarm upgrade |
| cargo area if there is no courtesy light switch as all | | | | designed to integrate with an existing H2 immobiliser. |
| doors need to be covered by the alarm.Motorhome | | | | Thatcham alarms for heavy goods vehicles are a |
| Thatcham alarm categories are also L1 for alarm and | | | | higher voltage then car alarms and the immobiliser is |
| immobiliser and category L2 to 1 for alarm upgrade | | | | designed for diesel engines. |