Great Device to Know Current and Voltage! Want to know how fast your smartphone and tablet PC are charging through the Micro USB interface? This lovely KCX - 017 USB Current and Voltage Meter is all you need! It can show you the USB charging current and voltage instantly. Through it you can quickly find out device\'s current and voltage stage, like USB cable, USB wall charger, car charger or solar panel charger, which gives you the fastest charging performance! Flexible, easy to use. KCX - 017 USB Current and Voltage Meter reads the charging status to you in real-time style! 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 Pre the small circle button and the data will be zero, then you can test next data 1. Input Voltage: 3 - 7V 2. Input Current: 50mA - 3500mA 3. Capacity: 0 - 19999mAh 4. LCD show voltage and current simultaneously 5. Save data each time power off 6. High precise current calibration function 7. High and low voltage alarm Model: KCX - 017 Design: Profeional Feature: Portable Function: Text Current and Voltage Interface: USB2.0 Package weight: 0.044 kg Product Size (L x W x H): 6 x 2.8 x 1.5 cm / 2.36 x 1.10 x 0.59 inches Package Size (L x W x H): 7 x 4 x 3 cm / 2.75 x 1.57 x 1.18 inches Package Contents: 1 x Current Voltage Meter 1Pcs LCD Micro USB Voltage Current Detector