1.  Smart Charger:This charger is include Intelligent micro control technologe to used to massage the circuit output,when overcharge, over discharged or short circuit, the charger dock will automatically cut off the power for safety. 2. Charger Function:Can be charging 4 Joy-Cons or 1 Pro Controller and 2 Joy-Cons at the same time.Use this charger station , the Pro controller and Joy-Cons full charge can be completed within 4 hours. 3.  Charger Indicator:When the controller is normally charged on the chager,When charging the Switch Joy-con or Pro controller, the charging indicator light displays red; and the charging indicator turns green after fully charged