Olatec Smart Digital LCD USB Turbo Charger, Voltage Current Multimeter, Digital Volt Reader, USB Power Meter, USB Tester Monitor Data on the screen will switch automatically, never need to press any button to switch data display Current transfers up to 2.4A at the maximum, enable you to shorter the charging time Built-in protection from overcharge and short circuit. Double Plug USB port and no need to tell the front side from the back side. Digital LCD displays the output current, voltage and the real capacity of your mobile devices