Well actually quite a few things use electromagnets such as a tv,remote control car, a phone (I don't know properly :s )and more
remote controls
Remote controls use both infrared and radio frequency technologies. Your typical TV remote uses infrared and your typical car remote uses RF.
Logitech makes great third party remote controllers, as does Sony and Universal. http://wize.com/remote-controls is a great resource to use to find out more.
Yes, there are Universal remote controls which can use for various electronic goods. There are many website selling Universal remote controls. Kindly refer to link : http://www.universalremote.com/
The computer manufacturers that also sell remote controls are : Sony, Panasonic, Samsung, Apple, Toshiba, LG, Phillips, BenQ, Dell, Fujitsu, Packard Bell.
Just about all remote controls have this feature these days.
no there is no use of electromagnets in iron box
Pencils, remote controls are two examples.Pencils, remote controls are two examples.Pencils, remote controls are two examples.Pencils, remote controls are two examples.
Sky remote controls are very easy to use. They are universal, and can connect to any TV, DVD/VCR player, or DVD recorder. They will work with absolutely anything, and they are easy to read as well.
Remote controls for Sky Digiboxes are not available at Amazon.com. Replacement controls can be ordered from http://www.sky.com/helpcentre/tv/remote-controls/order-replacement-remote-control/index.html?hcmp=search-article-sslc.
The Logitech Harmony 1100 is an excellent touch-screen universal remote and has very high ratings.