Practical Function: With the help of this product, You can make certain how much your standby appliances cost, what the power factor is, whether the appliances are really charged, how long have your appliances been charged. Kept Data: Built-in battery to retain the memory setting and store electricity even in a power outage. Dont worry about data loss due to a sudden power outage. Separate the power meter from the outlet to read the parameters carefully Money Saving Helper: Use this power meter to monitor the real-time power consumption, current and electricity cost of your electrical appliance, help you save energy and money Easy to Use: Easily measure the power consumption and cost of your electrical appliances. Simply plug the meter into the wall and then plug your appliance into the meter