This is a current/voltage monitor for USB. Want to know how fast your smartphone and tablet are charging through the 5-pin micro USB or Apple lightning 8-pin interface? This lovely USB power meter is all you need flexible, easy to use, and robust voltage and current tester that reads the USB status to you in real-time style wait to know why your USB charging is slow and take forever time? This cute device is what exactly you need - to show you the USB charging current and voltage instantly. Through it, you can quickly find out which USB cable and USB wall charger/car charger/solar panel charger gives you the fastest charging performance don't wait, want to dramatically speed up your charging experience? Go getting this must-to-have USB gadget right now.