Are you nuts?? My car stereo works just fine even when the interior temp is over 120 degrees!! So does the DVD player in fact! Not to mention my cell phone (an older 'smart' phone) and other electronics.
Also, I use a laptop in direct sunlight (not easy to do but I have a screen shield so I can see better) for HOURS sometimes on days where the temps are in the 80's and have not had it fail me yet (well, once, but that was because I forgot to plug the power cord in... silly me) nor do my JBL EON speakers (I am a mobile DJ - doing lots of weddings at the beach in Santa Barbara) which get VERY hot. My OLD ones did (had a seperate AMP, these speakers have a built in AMP) but not these.
The only issue I have with direct sunlight is me getting burnt to a crisp if I don't put on sunscreen...
