A complete end-to-end system featuring graphic, high definition, e-paper tags with up to three colors, a ESL Gateway and ESL Sever Software. Connected via a bi-directional, high-speed radio frequency (RF) infrastructure, and controlled by a centralized management and information system. ELECTRONIC SHELF LABELS. S-Label Electronic Shelf Label (ESL) tags are shelf edge price tags that electronically display product and price information. The S-Label ESL tag replaces the traditional retail shelf tag and electronically displays product information such as price, description, UPC code, discount rate and sale signs.