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Silver-tone Super Titanium chronograph watch with black dial, luminous hands, sapphire crystal, 42mm case, fold-over clasp bracelet

Citizen

Citizen CB5908-57E Eco-Drive Radio-Controlled Chronograph Watch

SKU CH-ZED4-B1YV7 MPN CB5908-57E

Radio-controlled chronograph with perpetual calendar, alarm and 200 m water resistance in a 42 mm titanium case

  • Atomic-clock accuracy within one second per 100000 years
  • 1-second chronograph measures up to 60 minutes
  • Perpetual calendar with 12/24 hour time and alarm
  • Luminous hands and markers behind anti-reflective sapphire crystal
  • 200 metres water resistance with Super Titanium case and bracelet

What this watch is and who it suits

The Citizen CB5908-57E is a radio-controlled Eco-Drive chronograph that receives atomic time signals for a margin of one second in 100000 years. It fits professionals and travellers who want a 42 mm titanium watch with perpetual calendar, alarm and 200 m water resistance. Buyers needing smartwatch notifications or a leather strap should look elsewhere.

Installation ease and common issues

The watch charges from any light source so there is no battery to replace, and the titanium fold-over clasp adjusts without tools for most wrists. Initial signal reception can fail indoors; placing the dial near a window overnight usually solves it. The screw-down crown must be fully tightened after setting to keep the 200 m rating intact.

The spec that decides fit

Radio-controlled atomic time sync with Eco-Drive light power is the defining feature; if you do not need automatic time-zone correction or a maintenance-free power source, a simpler quartz model will cost less.

Highlights

  • Atomic-clock accuracy within one second per 100000 years
  • 1-second chronograph measures up to 60 minutes
  • Perpetual calendar with 12/24 hour time and alarm
  • Luminous hands and markers behind anti-reflective sapphire crystal
  • 200 metres water resistance with Super Titanium case and bracelet

Specifications

No published specifications for this item yet.

Questions about this item

How can I confirm the Eco-Drive power reserve indicator is showing a full charge after initial light exposure?

Expose the dial to bright light until the power reserve indicator points to the full or high position; the watch will then run continuously without a battery change.

Which strap and clasp components are included with the CB5908-57E, and is a separate tool needed for sizing?

The watch comes with a silver-tone Super Titanium bracelet and a fold-over clasp; links can be removed for fit using a standard pin tool.

Should I choose the 12-hour or 24-hour display mode for the radio-controlled atomic timekeeping on this model?

Both 12-hour and 24-hour formats are supported; select the one that matches your preference, as atomic synchronisation works identically in either mode.

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