Designed for the healthcare market and capable of withstanding heavy use due to its UL Hospital Grade certification. Features include an improved overall 3.1A USB charging capability, auto-ground clips, zinc-plated ground terminal screw, as well as triple-wipe brass contacts for lasting retention. The screw-pressure-plate back wiring makes installation fast and easy.FEATURES:- Overall 3.1A USB charging capability: Combination AC duplex receptacles include two 5-volt DC USB ports that work with USB 2.0 & 3.0 compatible devices- AC receptacles available in 15 and 20 Amp, 125V- AC receptacles are tamper-resistant as standard: patented shutter system prevents improper insertion of foreign objects.- Multiple color options available.- Back and side wire terminals accommodate #14 AWG - #10 AWG stranded and solid copper wire.- Stainless steel auto-ground clips assure positive ground.