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Q: Does this watch receive a time signal in Asia and Europe

I had one in Afghanistan that did not. However I just set it for Kabul time ( one of the features) and it stayed accurate for a 8 month deployment. Not sure about Europe.

Q: "Casio Men's GW7900B-1 why is my background grey with black letters ?" and can I change to black background with grey letters I bought it duty free

Hi,The Casio G-Shock GW-7900B should have on its steel back plate, "GW-7900B" and a box with 3200 (module number).Maybe yours has "GW-7900" and 3193 instead ?Regards,

Q: does this have auto El

Yes it has auto EL, it can be set to manual or auto.

Q: does it has in built battery even though is solar

Yes it has a battery and yes you have to 'and can easily' replace it. It's about 13 bucks here on Amazon. Bought one yesterday. The one in it lasted for about 6 years.

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Description

⏱️ Time to own the moment with unstoppable precision!

BUILT FOR THE BOLD - 200-meter water resistance means this watch thrives in marine adventures and surface water sports.
RUGGED YET REFINED - Durable 50mm resin case with mineral glass blends toughness with sleek style for the modern professional.
GLOBAL ATOMIC PRECISION - Stay flawlessly on time with atomic syncing across 48 cities and 31 time zones.
UNSTOPPABLE SOLAR POWER - Harness the sun for endless energy—never worry about battery swaps again.
ALL IN ONE TACTICAL DISPLAY - From tide/moon graphs to 1/100-second stopwatch, get every metric you need at a glance.

The Casio Men's GW7900B Classic Solar Atomic G-Shock Watch combines solar-powered reliability with atomic timekeeping accuracy across 48 cities and 31 time zones. Featuring a 50mm resin case, mineral dial window, and 200m water resistance, it’s engineered for serious marine and surface water sports. Additional features include a 1/100-second stopwatch, tide/moon graph, daily alarm with snooze, and versatile 12/24-hour formats, making it the ultimate rugged yet sophisticated timepiece for active professionals.

Specifications

Age range	NO
Color	Black/Black
Size	One Size
Style	Solar Atomic Rescue GW7900B
Display type	Digital
Weight	68 g
Shape	Round
Material type	resin
Number of items	1
Outer material	Resin
Power source	Solar Powered
Features	Atomic Timekeeping, Solar Powered, Water Resistant
Sport	marine activity, water sports
Included components	Casio G-Shock MB-6 GW7900B-1 Atomic Solar Rescue Multi-Band
Batteries included?	Yes
Brand	Casio
Department	mens
Manufacturer	G-Shock
Item model number	GW7900B-1
Product Dimensions	10.16 x 5.08 x 5.08 cm; 71 g
ASIN	B00309HQPK