3 Way Wireless Power Meter Wirelessly monitor the electrcity usage and cost of up to three appliances around your home or office. Reduce your carbon footprint and cut your power bill. Reduce your impact on the planet and monitor your appliancesin use at once. Simply plug an appliance into each sender unit, enter your local electricity price and monitor the usage on the LCD of the reciever unit. You can also monitor the cumulitive usage via the memory as well as your greenhouse emissions. The Doss WPM03 Easy to install - no electician required - and easy to operate