Explosion Proof, Dust Ignition Proof; Two Hub, One Plug; for Use With Threaded Metal Conduit; for Use in Wet Locations | Designed for Commercial Markets With Strength and Durability in Mind, This Combination Usb Charger Duplex Receptacle Features 3.1a Overall Usb Charging Capability and Is Compatible With Usb 2.0 & 3.0 Devices