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.