1. Home Electricity Energy Monitoring System: The monitor is an intelligent instrument for monitoring and managing the electricity consumption in the home or building, which is composed of the receiver, transmitter and sensor.2. Real-time monitor the electricity usage: Monitor home electronic appliances, with cost calculations built right in. Display hourly/daily/weekly/monthly electricity consumption, CO2 emission. View historical for your energy usage in historic graphical chart. Audible alert to notify of excessive usage of electricity.3. REDUCE YOUR ELECTRICITY BILL: Measure power consumption in and cents to see exactly how much particular devices are costing you. Educate family to use energy effectively, reduce waste, cut costs down 30% which change your energy usage habits to do something for environment protection.4. EASY INSTALLATION: Easy to install and program. No electrician required. No need to change your existing meter (sensor' clip can be installed directly onto your existing breaker box )5. Audible alert to notify of excessive usage of electricityTransformer Quantity:2PCSColour:White & BlackMaterial:PlasticPackage Contents:1 x Wireless Power Meter2 x TransformerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.