Efan NC2 is a portable USB mini charger with a 1A maximum per position constant current and a tiny blue LED battery indicator. Its made of high quality materials and its is durable and reliable. Can charge simultaneously 2 different sizes of lithium-ion batteries such as 18650, 14500,16340. Provides reverse polarity protection, Activation function, Auto-detection charging system, Over-charging and short circuit protection. Compact size and modern design can always be with you ready to charge your batteries