Zte ZXHN F680 User Manual page 13

This equipment complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that
may cause undesired operation.
Caution!
Any changes or modifications not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.