The Mantis X8 Personal Archery Training System is an unparalleled piece of technology that will change the way you shoot. While attached to any bow, the X8 analyzes the smallest of movement patterns that even the human eye cannot see. It streams the data via Bluetooth to an app on your smartphone or tablet that gives you real-time feedback on your shooting mechanics. The X8 comes with a Universal Adapter, included in the box. You may consider ordering extras if you want to use on multiple bows.