• Get your electronics charged fast.usb 4 image by Bosko Martinovic from Fotolia.com
  
  A universal USB AC adapter is an indispensable tool for those that want to keep their electronic devices charged and ready to go. This power adapter is designed for devices such as PDAs, GPS navigators, speaker phones and smart phones. If you don't want to depend on your computer and need to charge an iPod, for example, use a USB AC adapter.
  
  

Appearance

• USB AC adapters primarily come in black or white. They appear to look like most power adapters except the fact that they are cordless. Instead of the cord, there is USB slot usually on the bottom of the adapter.
  
  

Size and Weight

• Sizes and weights may vary, but most USB AC adapters are designed to be small and compact. They are easy to carry anywhere.
  
  

Electrical Power Specifications

• Intended for use in the U.S., a USB AC adapter will accept an input voltage of 90-240Volts and will convert it to 5.2Volts and 500mA, which is safe for most electronic devices. Usually, the adapters are equipped with a LED indicator that will show the charging status: "green" for charging complete and "red" for charging.