RS400 / RS400sd Running Heart Rate Monitor User's Manual is a user manual for a sports heart rate meter produced by Polar Company. It mainly introduces how to wear, calibrate, use and set up the running heart rate meter.
This manual introduces the Polar RS400/RS400sd running heart‑rate watch, its accessories, and basic configuration steps such as language, time, units, weight, height and personal data. It guides users through starting a training session, using the built‑in sensors, and reviewing recorded data.
Later sections cover advanced settings, sensor calibration, battery replacement, memory management, warranty information and a detailed FAQ that helps resolve common issues like low‑battery warnings, button unresponsiveness, and sensor connection problems. This manual is written in Chinese.
| Battery type (watch) | AAA |
|---|---|
| Units | Metric (kg/cm/km) or Imperial (lb/ft/mi) |
| Display languages | English, German, Spanish, French |
It shows the battery is low or expired; the warning may also appear in cold conditions and disappears when the watch returns to normal temperature.
Press and hold all buttons for about 2 seconds until numbers appear on the display, then set the time and date again in the basic setup.