Hi Sal,
Thank you for asking if this Samsung dryer model is compatible with a 120-voltage and a 4-prong outlet.
This dryer is rated to use 240 voltage with 60 Hz frequency and 30 amperes. The power cord is not provided with U.S. electric model dryers. This cord is sold separately; hence, you can purchase a 4-prong cord to fit a 4-prong outlet.
Leo