EFEST SLIM K4 Quad USB-C Battery Charger is the newest charger in the K series from world famous EFEST. Boasting 4 channels of USB-C charging capability and auto smart cut off. The SLIM K4 is capable of charging at either 1A per channel with 2 batteries or 0.5A using 4 channels. The smart indicator light lets you know when the cell is in charging status. The indicator turns a solid white colour to alert you the battery has finished the charging cycle.