1) Home Electricity Energy Monitoring System: The monitor is an intelligent instrument for monitoring and managing electricity consumption in the home or building, consisting of a receiver, transmitter, and sensor. 2) Real-time electricity usage monitoring: Track energy use of home electronic appliances with built-in cost calculations. Display hourly, daily, weekly, and monthly electricity consumption and CO2 emissions. View historical energy usage in graphical charts. ble alert notifies excessive electricity usage. 3) Reduce electricity bills: Measure power consumption in watts and cents to identify the operating cost of individual devices. Help household members use energy more efficiently, reduce waste, and support energy-saving habits for environmental protection. 4) Easy installation: Simple to install and set up without the need for an electrician. No changes to the existing meter required; the sensor's clamp can be directly installed on the existing breaker box. 5) ble alert for excessive electricity usage. Material: Plastic Color: White + Black Package Contents: 1 x Wireless Power Meter, 1 x Transformer Note: Light reflection and differences in display screens may cause slight variations in color representation. Measurement error allowance is +/- 1-3 cm.