Question about Cardo Freecom 4+ JBL

Depending on the supplier: the Cardo device can also be paired with third-party devices such as Sena.
However, to benefit from all functions, it is advisable to purchase a second Cardo Freecom 4+.
There is also the Cardo Freecom 4+ duo, 800044.duo, where directly two devices are included in one package.

Here is the Cardo Freecom 4+ duo article : Cardo Freecom 4+ JBL DUO