The Efest LUC v4 is a high quality, four bay charger featuring an LCD display. The charger provides four independent charging channels with reverse polarity protection, short circuit protection, over-current protection and zero voltage activation function. The LUC v4 can automatically monitor battery power and features a completion alarm. The LUC V4 charger is compatible with most 3.7V Li-ion or LiMn batteries including 10440, 14500, 14650, 18500, 17670, 18650, 18700, 26500, 26650, 20700 batteries. The LUC v4 also features a USB charging port.