Zigbee channel to use

Hello,

Can you tell me which Zigbee channel the following products use:
Connected lighting micromodule 0 648 88
Connected power outlet 0 648 95
Wireless control 0 677 23
Wireless dual lighting control 0 648 94
Connected wired switch 0 648 91 
Wired switch with neutral 0 677 97

All are running the latest firmware available.

Thank you in advance for your response.