Who is your best friend when the night cold has come in your couch? electric blankets maybe most useful thing the home when watching TV. When you choose a electric blanket you must think safety. If you don’t want to injury by electric you choose a low voltage electric blanket. Some new low-voltage blanket includes a power supply box that changes 120 volt AC current (normal household current in North America) into non-hazardous low voltage DC current (similar to a battery) to provide protection and safety. When you buy it think this.