No Chest Strap Required.
Calorie Counter. Target Zone Alarm.

Standard size fits most people. 
for small size see  FitWatch 10s

The new S-Pulse technology displays heart rate and calories within 4 seconds of touching the sensors with your fingers.

Features:

-Time of Day/Daily Alarm
-ECG Accurate Heart Rate Measurement
-Calorie Counter
-High and Low Target Zone Alarms
-Scan Feature
-% of Maximum Heart Rate
-Audible and Visual Alarm
-Extra Large LCD
-Gender Settings (Male/Female)
-100 Hour Stopwatch
-100 Hour Countdown Timer
-Dual Time Zone
-Night Light