What’s this then on the DAF XF dash?

UK PROFESSIONAL DRIVERS FORUMS THE UK PROFESSIONAL DRIVERS FORUM (INTERACTIVE)
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Bluetooth receiver for mobile phone?

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you can get a phone cradle and bracket that screws under that cover. https://www.dafshop.com/accessories/daf-phone-cradle.html

I just use one of these in the CD slot https://www.cdslotmount.com/

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nomiS36:

Invest in a lickle paintbrush. Fair bit of clag around that switch