Install the fastest USB charger on the market. Charge your smartphones, tablets and laptops up to 40% faster than 3 to 5 A USB chargers, while enjoying the added power convenience of tamper-resistant outlets that meet NEC requirements. Industry leading charging capacity of 6 A, shared between both ports. Protects children: patented shutter system helps prevent improper insertion of foreign objects - now with black ''invisi-shutters'' for an invisible effect. The external brass back wire pressure plate and posted side wire terminal screws make installation fast and easy.