Wattson is a wireless device able to constantly measure and display how much electricity you consume in your home. Just clip the transceiver to the wire leading to your meter and fusebox and you’re done.
The exact number can be read on the display on the top (you can choose between watts and pound sterling) and by the ambient lights beneath it – blue means low energy consumption, read means high.
It’s USB-friendly as well, so if you hook it up with a computer you can compare your electricity usage with fellow Wattson owners around the world. Sweet.
Firebox UK: Wattson (Â£149.95, about 300 USD)