Polar FS1 heart rate monitor is currently the most basic of all Polar heart rate monitors. It is the entry level monitor in Polar's fitness monitor series (F- and FS- series). It is intended for general use and fitness training.
Here are the main features about the Polar FS1 heart rate monitor. It has:
Continuous Heart Rate Monitoring
Manual Setting of Heart Rate Training Zone with Audio and Visual Alarm
Duration of Exercise Session (using its Stop Watch)
Average Heart Rate of Exercise Session
Basic Time Keeping - can set the time only, but not day of the week or date
Wireless heart rate monitor composed of an analogue chest strap transmitter and a wrist watch receiver
your requirements are modest and you just want to use something simple, or
you have a limited budget.
Bear in mind that you can't exactly use it as a ordinary digital watch since you can't set the day of the week (Tues, Wed etc) or the date. The lack of a backlight may also be an issue for you if you happen to do a lot of exercise in the dark. Its suggested retail price is $69.95.
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The next one up in the series of Polar fitness monitors is the Polar FS2C (which supercedes the Polar FS2). It includes the two basic features missing in the FS1.