Xtreme is a great looking Heart Rate Monitor and Sports Watch packed with heart rate functions and chronograph features. It is ideal for runners and competitive athletes of all sports. Xtreme features a new graphical display, which provides a visual indication of exercise intensity compared to the active heart rate training zone. Three target zone settings are possible including a Cardiozone feature which allows a target zone to be automatically set during exercise, this works like the cruise control on a car to keep you in the zone. Xtreme has a powerful 100 hour chronograph with up to 100 lap and split times on screen and has 99 memories for lap time with average heart rate and split time. Xtreme is an excellent partner for interval training with automatic heart rate recovery on either a time or heart rate basis. It also features a countdown timer up to 99 hours.