Presently, referees wear wireless earpieces, to allow backstage officials to communicate with them during matches. Referees are also selected by their employers subject to their height and weight, and normally referees would be no more than six feet tall, weigh no more than 180 lb and may generally display a non-athletic physique; examples of this are WWE referees Mike Chioda and Charles Robinson. Wrestlers who either began as referees, or retired from the ring and continued as referees, often were under six feet. The purpose of this size discrepancy is purely to emphasize the height, weight and musculature of some of the larger wrestlers and to compensate for smaller stars.