It has five temperature settings, which it maintains until you change your setting. They are:
Warm - 90°C
Low - 120°C
Medium - 160°C
High - 200°C
Sear - 240°C
When you 'roast' a joint in the Prestige Multi Cooker, you're really braising or broiling it - much as you do in a slow cooker, only faster ;) You can sear the meat before reducing the temperature - this works great with chops, chicken quarters, etc. I find it's best to cook a joint or a whole chicken through more slowly, on Low or Medium (it's still quite fast: about the same time as it'd need in the oven,) and use the Sear function both at the beginning of the cooking and the end.