Energy Electricity Consumption Monitor
Current Cost Classic electricity monitor.
This is a wireless electricity monitor which displays how much electricity you are using at any one time and how much it is costing. It can help you reduce your electricity bill by providing information on the amount of electricity you are using so that you can see the financial gain of being electrically efficient at home or in the office.
Details here - http://www.currentcost.com/product-theclassic-specifications.html
Installation information here - http://www.currentcost.com/product-theclassic-installation.html