Perpetual Chrono A.T - UNITE with BLUE - CB5874-81L

Eco-Drive technology utilizes a solar cell that converts light energy (natural or artificial) into electrical energy, which is stored in a rechargeable power cell. This eliminates the need for traditional battery replacements.

Under normal use, the watch should maintain its charge when exposed to light regularly. A full charge can power the watch for several months in darkness. For optimal performance, ensure it receives ambient light daily.

Radio Controlled means the watch can automatically receive time signals broadcast from radio towers. This allows it to maintain extremely accurate time, automatically adjusting for daylight saving time and time zones when properly set.

Yes, the watch has a water resistance of 10 bars (100 meters), making it suitable for swimming, showering, and other water-related activities. However, it is not designed for deep diving.

The watch comes with a warranty of 2 years from the date of purchase, covering manufacturing defects.

Strap adjustment typically involves a professional jeweler or watchmaker who can add or remove links. Some clasps may have micro-adjustment settings. Please consult your user manual or a professional for precise adjustments.

The tachymeter is a scale on the bezel or dial that allows you to measure speed over a known distance. For example, if you travel one kilometer, you can read your average speed in kilometers per hour from the tachymeter scale.

Expose the watch to a bright light source for at least a few hours to recharge the Eco-Drive power cell. If the issue persists, check the user manual for specific reset procedures or contact customer support.

Ensure the watch is in an area with good radio signal reception, away from electronic interference. Try manually initiating a time reception. Check that the correct home city is set in the watch's settings. If using the watch for the first time or after a long period of darkness, it may take multiple synchronization attempts.

The chronograph may need to be reset. Refer to the user manual for instructions on how to reset the chronograph's sub-dials back to their zero positions.

Immediately stop using the watch and take it to an authorized service center for inspection and repair. Do not attempt to dry it yourself, as this can cause further damage.