LOK8U Freedom Wandering Prevention and Emergency Alert Watch The Freedom system comprises a wristwatch incorporating GPS and GSM locator with lockable strap, a portable receiver, and a charger base Requires 1 year Contract for secure web portal, tracking, email, & text message alerts which is $50/mo. The portable receiver sends out a signal that's picked up by the watch and transmitted back. Materials Case: High-Impact Polycarbonate; Band: Non hypoallergenic rubber Positioning &lt; 10ft outdoor RF range; 35ft max indoor, 100 yards, max outdoors, users variable (high, medium, low) As far as the wearer is concerned Freedom is a digital watch. It is affixed to the wrist as a normal wrist watch but has a locking feature which can only be removed by using the special release tool.