Hi Mathieu and
to the forum.
The Bluetooth only option will probably be just the plugin Bluetooth dongle, but the Bluetooth + PAS option will come with both the Bluetooth dongle and the pedelec sensor:
I presume the kit would also be supplied with the matching connector for the PAS sensor to plug into
if you select the + PAS option, but it might be worth confirming this via phone or Live chat if you are going to use the Pedelec function.
Alan