Electro-Magnetic-Pulse, this is a wave pulse which destroys all semiconductors and transistors rendering most devices, portable or stationary useless. Here are just a few technologies that will not work:

• Power grid
• Tap water will stop
• Most automobiles will not function
• No refrigeration
• No communications
• No internet
• Not working trauma care centers
• No ATM nor banking
• No food supplies
• No local nor Statewide government services
• Limited or no medical services nor medical supplies