Understand more about your laptop or smartphone with the Satechi USB-C Power Meter Tester. Using the brand new USB-C port, this device calculates and measures the power draw of your device. This information can show you the voltage, current, wattage, and milliamp hours. In addition to understanding your device, this information helps you make decisions about which devices to use. On the top of the Power Meter is a display screen with the relevant information. The display is bright and easy to read. Once you plug it in, all of the data appears in real-time so you get the full picture. Thanks to the compact size, you can take the Power Meter with you anywhere you go.