Credit: Christopher Harting

Stick this device between a wall socket and any electronic equipment and it will tell you how much electricity the gadget uses, how much that electricity cost, and how much carbon dioxide was emitted to produce it. The monitor comes preloaded with costs and emission levels that reflect U.S. averages; users can also program it with local rates.

Product: Conserve Insight Energy Use Monitor

Cost: $29.99

Availability: Now

Source: www.belkin.com/conserve/insight

Company: Belkin