GREENCYCLE 3 PK 15-Amp 150 volts Outlet Receptacle Screwless Wallplate with Dual AC & USB Charging Ports Highest power device on the market, two vertical powered USB Ports, two AC Ports 2.1A charging capacity, back wired for easy installation Smart chip-powered USB ports recognize the requirements of attached device and optimize charge accordingly 00% safe & listed to multiple UL, NEC (National Electrical Code), and IEC (International Electrical Commission) standards Energy-efficient, spring-loaded Safety Shutter design turns USB ports off when connecting cable is removed