Zte BLADE V7 User Manual page 54

This device was tested for typical body support operations.
To comply with RF exposure requirements, a minimum
separation distance of 1.0 cm must be maintained between
the user's body and the device, including the antenna.
Third-party belt-clips, holsters, and similar accessories used
by this device should not contain any metallic components.
Body accessories that do not meet these requirements may
not comply with RF exposure requirements and should be
avoided. Use only the supplied or an approved antenna.
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