Drivers hoping to reduce their insurance costs by installing a little black box in their car need to watch out for fees of up to £90 if they later want it removed.
When you sign up to black box insurance, a specialist fits a computer the size of a smartphone under your dashboard.
This uses telematics technology to track your driving habits.
The idea is that you are rewarded for driving safely. If you speed, brake suddenly or regularly drive at night, you are likely to see an increase in your premiums.
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It is free to have the technology installed in your car because this is built into the cost of your premiums.
However, it has emerged that some insurers will charge a costly fee if you decide you want to have it removed later down the line.
The AA and Co-operative Bank charge drivers £90 to disconnect the box. Insure The Box says it charges customers up to £50. Direct Line, on the other hand, does not charge any removal costs.
Customers can ask their insurer to simply turn off the box and leave it in their car — its size means it isn’t intrusive.
But if you switch to another telematics provider, you will need to have another box installed because each uses slightly different technology.