Wide Applicability: This USB Power Meter Measuring voltage: 4V-30V; measuring current: 0-6.5A. Supports QC2.0, QC3.0, iPhone 2.4A/2.1A/1A/0.5A, Android DCP/AFC, FCP(9V/2A)/SCP(4.5V/5A), Super VOOC fast charge protocol identification, let you know the charging status of the phone. Support for high current testing, support USB3.0 interface mobile hard disk and U disk test. Power-off Storage, Measuring Data is Guaranteed: This USB Tester has a power-off storage function, which can store capacity and power data when the mobile power supply is powered off, which is convenient for subsequent viewing and facilitates the measurement of the capacity and power of the mobile power supply. IPS LCD Display: Uses a 0.96-inch IPS high-definition color LCD display to display the state of charge of the appliance, voltage, current, capacity, energy, power, equivalent impedance, temperature and other indicators at a glance. 4-bit accuracy for more accurate measurements. Note: The button of this product will make a sound when it is shaken, which is not a product defect. This is an adjustment to be made to quickly double-click the button, which is a normal situation.