Instruction manual for Omron HR-100C Heart Rate Monitor. It introduces the various components and functions of the product, including personal data, maximum heart rate, training zones, etc. Provides operating instructions, including control buttons, operating mode selection, basic settings, time and date settings, alarm settings, heart rate limit settings, backlight feature usage, stopwatch feature usage, etc. It also explains the use of the transmitter, receiver, water resistance, and effective range. Troubleshooting, battery installation, and maintenance are also provided.