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With the following accessories you get the most out of your S725 Polar Cadence Sensor: A wireless sensor that measures the speed at which you turn the pedals of your bicycle. IR Interface: The Polar IR interface is designed for communication between Polar heart rate monitors and Polar software products. For infrared connection to your PC you need a Polar IR interface if you do not have an IrDA port in your PC. Power Output Sensor: The Polar Power Output system measures pedaling power when cycling. It also measures left/right balance (LRB describes the share of power output of left and right as a percentage), pedaling Index (describes how evenly power output was produced during a cycle round), speed, cadence and distance. If you use the Power Sensor, you do not need to mount any other accessories on your bicycle. USER MANUAL ENG CYCLING HEART RATE MONITOR CYCLING HEART RATE MONITOR Polar S725 offers you the possibility for infrared communication with Polar training analysis software. See the instructions from the CD-ROM set. S725 S725 17924519.00ENGA Display symbols See the glossary for display text interpretation. Indicates an ongoing heart rate measurement and flashes to the beat of your heart. Indicates there has not been heart rate reception for at least 5 seconds. - - Indicates there is no heart rate reception. Bring the wrist unit up to your chest near the transmitter's Polar logo. The wrist unit starts looking for the heart rate signal again. Options mode: indicates that you are setting the bike functions. Measuring/Recording mode: indicates that bike 1 or 2 is on. File mode: indicates cycling information. In the Time of day display the alarm is on. Measuring mode: beeps if you are exercising outside your target heart rate zone. Fitness Test mode: sounds an alarm at the end of the fitness test. Indicates the Interval Trainer. Indicates continuous interval (Cont). Recording mode: indicates the heart rate above the target zone. Recording mode: indicates the heart rate below the target zone. The graphic bar consists of five blocks. A flashing block indicates in which level you are in the Options settings or File recalling loops. Continuously running bars indicate that the exercise is recorded. Indicates low battery.