The Efest LUC S2 is a high-tech smart LCD Charger. It has a large blue LCD display screen, which can show the charging status clearly when charging the 3.7V batteries. It is designed with two built in independant charging channels which means two 3.7v batteries can be charged at the same time. The EFest LUC S2 is designed for good, safe performance with reverse polarity protection, short circuit protection and over current protections. The Efest LUC S2 is a high quality device with advanced charging numeration and will protect the batteries automatically during the charging cycle.