Display : E-ink E-paper Display Display Color : Red+White+Black Display Size : 7.5 inch, 640*380pix, 100DPI Battery : CR2450 * 6 Power Life : more than 5 Years Replacement battery : Quick - Release Frequency : 443MHz Memory : 4 Pages Cache Usage : Digital Shelf Label Electronic price tag Temperature Monitoring : Available What is Suny Electronic Shelf Label? Our Electronic Shelf Label System make up by three parts: Electronic Shelf Label, Base Station, Software. Working principle : PC(software) control Station by LAN, Station control price tag by Wireless(433MHz). MOQ=100PCS