Citizen Eco-Drive x Radio-Controlled ft. Tsuki-Yomi Moonphase aka 30th Anniversary Men Formal Round 100m Water Resistant Watch BY1010-81Z BY1010 BY-1010Experience groundbreaking innovation with the Citizen Tsuki-Yomi Radio-Controlled Moon Phase watch - the world first light-powered moon phase movement. Featuring Super Titanium construction and self-adjusting moon phase display via radio signals. The striking purple lunar dial and Eco-Drive technology (powered by any light) make this 30th-anniversary edition a true horological marvel.Caliber Number / MovementH874 (solar Eco-Drive)Power Reserve / AccuracyApproximately 6 months when fully charged (+/-15 seconds per month without reception)CrystalSapphire crystalLuminousLuminous on hands and indexesCase / Band MaterialSuper Titanium (Duratect) case with Super Titanium (Duratect) band (three-fold clasp with push-button release)Water Resistance100m / 10 barCase SizeThickness: 10.9 mmDiameter: 43.0 mmLength: 47.3 mmLug Width: 22.0 mmOther SpecificationsCitizen Eco-Drive x Radio-Controlled ft. Tsuki-Yomi MoonphaseSummer time (automatic / manual switching)World time function (24 time zones)Perpetual calendar (to 28 February 2100)Moon phase display (automatic calculation)Moon phase display switching function (Northern or Southern Hemisphere)Power reserve indicatorOvercharge prevention functionInsufficient charge warning functionPower saving function (hands stop to save power when left in the dark)Automatic hand position alignment functionDay, date and 24-hour displayRegular timekeeping (analog display)Global Radio-Controlled FunctionReceiving time signal (automatic, on demand, auto recovery)Signal stations: Japan (East/West) / USA / Germany / ChinaAutomatic signal station selection function (for Japan standard signals only)Confirming reception status (RX)Indicating the result of last reception (OK/NO)
