Overview: This device is fitted with a safety system preventing more than one plug from being used at the same time. The 3 plugs must therefore be used separately. In addition, you can use the USB (Universal Serial Bus) top to quickly charge your USB (Universal Serial Bus) devices. To open: When you want to use any type of the plug, just turn the grooved plastic ring until the arrow is pointing towards the target mark. To close: Turn the grooved plastic ring until the pointer has returned to its original position. You can plug this into any available power outlet & then connect your device to the universal adaptor. If the indication light shows red, it indicates that the adaptor is working. Specification: Weight Approx:124.5g Size Approx:6.3 x 5.8 x 5.8