See also:

Sockets
The lighter socket can be used as a socket for electrical equipment while the engine is running or when the ignition is switched on. The total load of all sockets must not exceed 140 watts at ...

Safety
Neither the Insurance Institute for Highway Safety nor the National Highway Traffic Safety Administration has tested the 2007 X3. Standard safety features include four-wheel-disc antilock brakes, ...

Switching off automatically
The system switches off and the LED goes out: After approx. 160 ft/50 m when driving forward. Above approx. 22 mph/36 km/h when driving forward. Switch on the system again if necessary. ...