It is a portable charger for phones or compatible devices with USB charging port and a port to charge the two 2600 Mah batteries. It uses an 7.5vdc AC adapter for charging the batteries. Inside is a step down board to regulate the voltage to 5vdc for the devices. It charges a phone with a 1700Mah battery in about 2 hrs. at .6 amps. The wall charger is the same at .6 amps.
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