We sell only the BEST heat rocks for reptiles. They are called rocks. They warm up from your basking light! If you have a heat rock that plugs in, throw it away or you will soon have a dead or dying reptile.
Reptiles do not have good heat receptors on their stomachs, and can be badly burned. If you were sold a heat rock, kindly go back to the pet store and tell them you'd like to return it and spend that money elsewhere.