Soleus PR HRM chest strap HRM hrm zones interval timers calories burned chronograph Heart Rate Monitor, Analog Transmission, HRM Zones, Comfortable Chest Strap, Calories Burned, 6 Interval Timers Data Storage, Chronograph, 5 Alarms, EL Backlight, Night Mode, 100M Water Resistant Quartz Movement Case Diameter: 47mm Water Resistant To 330 Feet Kindly click on the First Image and refer to The remaining Images for User Manual