An electronic price label is described which can be secured to a product by attaching the label to a theft prevention tag and securing the tag to the product. The label includes a display portion attached to an extension which can be retained within the theft prevention tag when the tag is closed and...http://www.google.com.hk/patents/US6774794?utm_source=gb-gplus-share專利 US6774794 - Methods and apparatus for attaching an electronic price label to an electronic theft prevention tag
