Novatel Merlin XU870 - Manual (Page 51)

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Before this device is made available for sale to the public, it must be
tested and certified to the FCC that it does not exceed the limit
established by the government adopted requirement for safe
exposure. The tests are performed in positions and locations (for
example, at the ear or worn on the body) as required by the FCC for
each model.
The FCC has granted an Equipment Authorization for this wireless
modem with all reported SAR levels evaluated as in compliance with
the FCC RF exposure guidelines. The highest SAR value for this
modem when tested for compliance against FCC standards was
1.366W/kg.