Lenovo S850 Manual page 21

SAR compliance for body-worn operation is based on a separation
distance of 10 mm between the unit and the human body. Carry this device
at least 10 mm away from your body to ensure RF exposure level
compliant or lower to the reported level. To support body-worn operation,
choose the belt clips or holsters, which do not contain metallic components,
to maintain a separation of 10 mm between this device and your body.
RF exposure compliance with any body-worn accessory, which contains
metal, was not tested and certified, and use such body-worn accessory
should be avoided.
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