Abstract: An electronic price display system has myriad price display labels. A mobile unit follows a path through the system, at one time or another along the path reaching sufficient proximity to each label to transmit power to it and thus to power it for the receipt of a message and to allow the label to acknowledge the message. The labels desirably do not rely upon battery power but have bistable regions providing homan-perceptible messages such as prices. The labels preferably are flexible and are pre-formed with a curvature well suited to standard grocery store shelf edge channels.