Hey there,

from my point of view it's okay to write a thread in english here, if it's marked so (just like you did in the title).
As far as I know there is only a pager, which is able to receive POCSAG messages on two frequencies, but this pager just listens on one channel in 2m- and one in 70cm-band. This is used for the reception of alarms on 2m and public paging on 70cm.
Something like the device you are looking for is unknown to me.
Perhaps someone else knows more details?!

Geetings,
Funkwart