At its most basic, a turnstile is simply a gate that manages pedestrian traffic flow by allowing the single-file passage of people in one or two directions. However, many turnstiles boast more advanced features that enable them to integrate with other access control systems to increase security while controlling people flow. For example, turnstiles can accommodate a range of credential readers, including keypads, card readers and biometric readers. http://www.hptchina.com/wide-lane-turnstile/