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: Monitor 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. Audible alert notifies of excessive electricity usage. 3) Reduce Electricity Bill: Measure power consumption in watts and cents to see how much individual devices cost. Help family members use energy more efficiently, reduce waste, and potentially lower energy costs by changing usage habits for environmental benefits. 4) Easy Installation: Simple to install and program. No electrician required. Sensor clip can be installed directly onto existing breaker box without replacing the current meter. 5) Audible alert for excessive electricity usage. Material: Plastic Color: White + Black Package Contents: 1 x Wireless Power Meter, 1 x Transformer Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.