Laptops get hot ! After an unfortunate experience with a (Branded !) cooling tray - which wrecked my previous Laptop I will never plug any mechanical device into my Laptops USB ports again! - New set up ,extension lead , this plug to the Laptop , USB to the cooling tray . Masterplug have the" any connected device" warranty so seems safe to me and at £8.60 delivered from Wizzywoo , an Amazon Merchant seller - a bargain and no need to spend £10 with Amazon to get the free postage . Great reviews but seems its a bit short on power for charging 2 fairly high demand things at once . Simple for me -cool the Laptop when I'm using it ,charge the MotoG and Nexus when I go to bed .