Digital Voltmeter taken with backlight

What is the voltage in your outlet right now? If you get the multimeter is because it does not have, still, a digital Voltmeter of taken as below:

A simple product: on the back we have the AC power (American square model).

And on the front a LCD to show the voltage on the voltmeter is plugged.

Below the voltmeter working. Here in Rio de Janeiro the mains voltage is 127V.

I thought it was pretty cool, Although not very useful. In my old House is that it would have been nice to have placed to monitor the network, because the voltage by varying the dealership lived would solve the problem. Those interested I leave the link to the store DealExtreme:

http:///p/dm55-1-1-5-lcd-digital-ac-power-voltage-monitor-meter-white-ac-80-300v-us-plug-234091 dx.com