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