it's already in neman marcus stores. it's one of hundreds of new high tech products at the national retail federation annual expo in new york. customizing shopping is front and center. these smart shelves are already in walmart stores and have screens that highlight preferences of repeat customers. shopping carts may soon be updated with this fancy focal tablet that keeps a running tally of the cost as you toss in items and snags good deals. >> if you are in the v isle, it will show you deals. in the shampoo isle, it shows you deals on the shampoo. >> reporter: the tablet hitting a few stores this summer also works as grocery store gps. >> you can search and type cheerios and it will say you are here, it is there. >> reporter: no more waiting in the check out. the idea is to have roaming cashiers check your cart and swipe your credit card in just a few seconds. >>> our sister station the cw introduce us to a new hero from the d.c. universe. sitting down to the two who play the daughters of black lightning. >> i love play