Ever wonder how much your air conditioner is really costing you? Or how your electricity bill got so high? Or how energy efficient your new LED lamp really is? All of these questions, and more, can be answered with a device that is less expensive than a trip to the movie theater. Not only that, but used properly, the P3 P4400 Kill A Watt Electricity Usage Monitor can actually save you money, by showing you which devices in your house are jacking up your electricity bill.

The device is super simple to use; simply plug it into an existing electrical socket, and then plug the device you want to monitor into the Kill-A-Watt monitor. The device will function as it normally does, while the Kill-A-Watt records voltage, time, consumption by kilowatt-hour, and more!