Features: * Adopt Micro USB DC 5V input, single slot independent charging and management system. * There are two kinds of charging currents to choose from (500mA/1000mA). * The built-in LED indicator shows the real-time voltage and current of the charging status. * Automatic identification of Li-ion and Ni-MH batteries and manual selection of LeFePO4 batteries (Automatic identification of 1.20V/3.70V batteries, manual selection of 3.20V/3.80V batteries). * With protection of overcharge and over-discharge, short circuit, intelligent identification of bad batteries and reverse battery detection. More Pros: * Automatic detection of battery polarity (+- polarity). * With 0V voltage activation function, 1.6-2.2V cannot be charged.