There appears to be a simple way of having a limited hands-free telephone and Bluetooth audio appliance bridged to the auxiliary audio input of the standard ‘Swing’ car radio of Škoda Fabia 2010 (5J)
In this case my priority was doing and paying as less as possible in exchange for being able to answer incoming calls, hear the calling party and play audio from a mobile phone over a Bluetooth link using the standard-issue stereo system.
After a superficial search, I have chosen the Besign's BK01 Bluetooth kit.
Given quite an unfortunate, I must say, location of the AUX socket, the absence of USB connectors in that car, and short cables of BK01 (120 cm to the USB connector and 185 cm to the 3 mm stereo connector) the following is the best way of tools-free installation that I was able to come up with.
The AUX and USB connection (note the armrest is up).
The cable is tucked behind the trimming of the armbrake and the grearbox.
The magnetic holder is glued left of the door locking switch.
Vadim Penzin, September 3rd, 2018
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