When you have a charger, data cable or power bank, you probably have these questions: Is the charger really outputting as much power as described? If the charger is not original, will it overcharging or overloading my cellphone? Is this cable good enough to deliver 1.5A or 2A I want? The power bank seems not that capacity as described, does it? Now you have portable and easy use device to find the answers, moreover, you can test almost everything about electronics as long as they are using USB charging.Features- Color: Black.- Material: Plastic.- Size: 6x2.8x1cm / 2.4x1.1x0.4inch.- Input: 4-30V/50mA-3000mA.- Output: 4-30V/50mA-3000mA.- Capacity: 0-19999mAh.- It can test current and voltage of phone, mobile power bank etc.- With a USB port and micro USB interface, convenient to test devices.- With LCD screen, easy to see the current and voltage of the devices.- Small size and lightweight, easy to carry.- It has been designed with backlight LCD, very convenient for you to read the data even in the dark.