StarTech.com USB Voltage and Current Tester Kit - USB Voltage and Current Meter LCD Display & LED Light - USB Fast Charge Adapter Monitor how well your phone and tablet are charging as well as your device's current and voltage consumption USB Voltage Tester / USB Fast Charge Adapter / USB Voltage Monitor / USB Current Monitor / Current and Voltage LCD Display and LED Light / USB Voltage and Current Meter with Micro-USB Cable Test the voltage and current consumption of your Apple and Android devices Fast charge your tablet and smartphones from your computer or laptop USB port 2-year Warranty