The Suunto Spartan Range features GPS, Bluetooth, a huge range of sports functions and a colour screen with some models having a colour touch screen.
The Spartan Ultra has the most features, the largest face and the longest battery life.
The Spartan Sport is a sports version of the Ultra with the same sports functions plus the compass but without the outdoor functions and in a slightly slimmer design.
The Spartan Sport Wrist HR is very similar to the Sport but features a wrist HR monitor allowing you to monitor your heart rate 24/7.
The Spartan Trainer is a slimmed down version of the Sport Wrist HR with purely sports functions and a Wrist HR but no touch screen.