The ProLink smartphone holster and case is comprised of two parts. Smartphone Case The smartphone case is sleek and lightweight but strong enough to protect your smartphone during rigorous use. Holster The ProLink holster attaches to your belt. The two pieces (case and holster) are connected by a Kevlar® tether that ensures when you drop your smartphone, it will never hit the ground. Current version works with iPhone 4, 4S and 5.