most important information With devices for generating electrical energy, you can check which devices are uneconomical - so you can implement savings plans and reduce electricity costs. Check how much energy your computer, TV, washing machine uses... Lower power consumption means less CO2 is released into the environment - the meter shows the CO2 consumption of the controlled devices Energy meter This measures the energy consumption of household appliances (and calculates their costs), so you can see which devices use the most electricity and therefore limit their use. This limits the energy required for electrical power supply. Package includes Wattmeter User manual Specifications: Regulations/European Regulations/American Regulations /British Regulations/Australian Regulations. When purchasing, please ensure that the meter is not suitable for you. Save Settings - The meter comes with an additional battery on the back of the device to save settings and data on the device even when the meter is not connected. Batteries are not required to operate the device, but without them the settings will not be saved after disconnecting the power supply.