iTraq demonstrates their GPS tag. The tag uses cellular tower networks to determine the position of the tag (triangulation). It can be charged wirelessly and has a battery life of up to four months. The accompanying app can be set up to detect multiple tags, and to alert the app user if any tag moves out of the specified area. The Panic mode feature activates the GPS chip inside the tag, allowing for precise location at the cost of higher battery consumption. The iTraq+ sells for US$129, with the wireless charger costing an additional US$30.