See also:

Accessory installation
We strongly recommend that Volvo owners install only genuine, Volvo-approved accessories, and that accessory installations be performed only by a trained and qualified Volvo service technicia ...

On/Off button
To activate the system: 1. Turn the ignition key to position I. NOTE If you switch off the ignition while the audio system is on, the system will be on when the ignition is switched on again. ...

Setting a speed
Use the or buttons set the vehicle's current speed. The set speed is shown in the display. NOTE Cruise control cannot be engaged at speeds below 20 mph (30 km/h). ...