The LiitoKala Lii-402 Li-ion Lithium Battery Charger is a versatile unit designed to charge AA and AAA batteries safely and efficiently. With 4 slots and a voltage of 3.7V, this charger is perfect for high drain devices, such as smartphones, cameras, and other electronic gadgets. The USB input allows for convenient connectivity, while the Li-Ion chemical composition ensures reliable power storage. Backed by a 1-year manufacturer warranty, this charger is a reliable choice for keeping your devices powered up for longer.