Tsuki-Yomi Radio-Controlled Moonphase BY1010-57L - Watch CITIZEN - Free user manual and instructions
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| Product Type | Radio-Controlled Moonphase Watch |
| Brand | Citizen |
| Model | Tsuki-Yomi Radio-Controlled Moonphase BY1010-57L |
| Movement | Eco-Drive (Solar-Powered) with Radio Control |
| Caliber | H8** series (specific caliber may vary) |
| Case Material | Stainless Steel |
| Crystal | Sapphire Crystal with Anti-Reflective Coating |
| Band Material | Stainless Steel Bracelet |
| Case Diameter | Approx. 42 mm |
| Case Thickness | Approx. 12 mm |
| Weight | Approx. 150 g |
| Water Resistance | 10 bar (100 meters) |
| Power Source | Solar Charging (Eco-Drive) with Radio-Controlled Timekeeping |
| Power Reserve | Approx. 5 months (fully charged) |
| Time Adjustment | Automatic Radio Control (Atomic time synchronization) |
| Functions | Moonphase display, Date, Radio Control, Perpetual Calendar, 24-hour indicator |
| Radio Signals | Multi-band (Japan, USA, Europe, China) |
| Care Instructions | Rinse with fresh water after saltwater exposure; avoid magnets and extreme temperatures |
| Spare Parts & Repair | Contact Citizen authorized service centers |
| Warranty | 5 years (varies by region) |
Frequently Asked Questions - Tsuki-Yomi Radio-Controlled Moonphase BY1010-57L CITIZEN
How does the radio-controlled timekeeping work?
The watch receives atomic time signals from multiple stations worldwide (Japan, USA, Europe, China) to automatically adjust the time and date. It syncs daily, typically overnight, to maintain accuracy.
Is the moonphase display accurate and how does it work?
Yes, the moonphase is accurate to within one day in 122 years. It shows the current phase of the moon based on a precise gear mechanism, synchronized with the perpetual calendar.
Does the watch need a battery?
No, it uses Citizen's Eco-Drive technology which converts any light (natural or artificial) into electrical energy. A built-in rechargeable cell stores power, eliminating the need for battery changes.
How long does the power reserve last?
When fully charged, the watch can run for approximately 5 months without further light exposure. However, to maintain radio reception, occasional light is recommended.
Can I manually set the date and moonphase?
Yes, manual adjustment is possible via the crown and pushers. However, after a radio sync, the correct date and moonphase will be set automatically.
What water activities is this watch suitable for?
With a water resistance of 10 bar (100 meters), it is suitable for swimming, snorkeling, and showering, but not for deep diving or high-impact water sports.
How to set the watch after a full discharge?
Place the watch in bright light for a few hours to charge. Once charged, the watch will automatically attempt to receive a radio signal. You can also manually set the time and date using the crown.
Does the watch automatically adjust for Daylight Saving Time?
Yes, the radio-controlled system automatically updates for DST based on the selected time zone. You can also disable automatic DST adjustment if needed.
What should I do if the watch does not receive the radio signal?
Place it near a window, preferably at night. Avoid metal or electronic interference. You can also manually set the time and date until a signal is received.
Is the bracelet adjustable?
Yes, the stainless steel bracelet can be sized by removing links. It is recommended to have this done by a professional jeweler to avoid damage.
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USER MANUAL Tsuki-Yomi Radio-Controlled Moonphase BY1010-57L CITIZEN
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Product information
Brand : CITIZEN
Model : Tsuki-Yomi Radio-Controlled Moonphase BY1010-57L
Category : Watch