What is the fine-grained topic of the following text: Operates using an unlicensed 2.4GHz radio frequency (RF) hopping design that has global regulatory acceptance and superior interference immunity versus other narrow band RF sources.Users are able to choose from many different confirations of the Sabre 1552 scanner including keyboard wedge, RS 232, POS terminal or wand emulation interfaces, and standard, long-range, high density and high visibility laser scan engines, and Vista linear scan engine for additional application versatility. Only return the topic.
Features and configurations of the Sabre 1552 scanner