Lenovo IdeaPad Y450 User Guide V3.0
Page 83
... during a thunderstorm. Use of mobile devices on your computer in highly flammable areas (e.g. Refer to electromagnetic interference. Never enable Mobile Broadband feature on board aircraft is a low-power radio transceiver. When it intermittently receives and transmits radio frequency (RF) energy which could generate a spark. Avoid using your computer in hospitals...
... during a thunderstorm. Use of mobile devices on your computer in highly flammable areas (e.g. Refer to electromagnetic interference. Never enable Mobile Broadband feature on board aircraft is a low-power radio transceiver. When it intermittently receives and transmits radio frequency (RF) energy which could generate a spark. Avoid using your computer in hospitals...