One report asserts[8] correlations between the use of mobile phones and other portable electronic devices in flight, and various problems with avionics. Another study[9] concluded that some "portable electronic devices", including laptops, electronic toys and laser pointers, used in the cabin can exceed the aircraft manufacturer's permissible emission levels for safety with regard to some avionics, while they were unsuccessful in duplicating any of the errors suspected to be caused by these devices use in controlled lab conditions.