OKC21B-E4   equipped with newest popular four-color e-paper display, its vivid colors can adapt to any retail scenario. It supports text, promotional messages, QR codes, or barcodes.It can also be applied in various scenarios beyond retail, such as logistics management,tags, loss prevention cards, access cards, visitor cards, or ID Cards.This series of products use Bluetooth communication with Bluetooth base station. You can use mobile app and web version of the background management system for its unified management, you can use our background management system, you can also use your own software and background management system (we provide technical support)