Efest LUC S2 Battery Charger is a high-tech dual slot LCD battery charger. The LUC S2 features large LCD display screen which shows various charging information. It features two battery slots with two independent charging channels allowing you to charge simultaneously two 3.7v batteries at the same time. The Efest LUC S2 comes with various safety features for consistent performance and safe charging: reverse polarity protection, short circuit protection, and over-current protection. It is capable of charging large-form batteries and compatible with various battery types.