These USB charging devices are designed to power up your electronic devices more temporarily and reliably with out the will of bulky AC adapters. Charge one device or a couple of devices from a single USB receptacle. Charge two devices concurrently whilst leaving room to power other appliances. Compatible with USB 2.0 & 3.0 compatible devices. Total charging capacity of 4.0A. AC receptacles are tamper-resistant to satisfy NEC necessities. Back and aspect wire terminals accommodate #14 AWG – #12 AWG same old and solid copper wire for installation flexibility. Includes screwless wall plate and same old wall plate.