G-Shock Tough Solar Atomic Timekeeping Watch GW7900-1

Pursuing further toughness while inheriting the DNA of the first G-SHOCK model (DW7900) the GW7900-1 is constructed with a solid metal case and a screw back. This timepiece is also equipped with advanced technology, Multi-Band 6 that receives standard radio waves from 6 stations around the world. The metal case and screw back are made of DLC (diamond-like) to enhance wear resistance, and the screw back is also mirror-processed to create a luxurious finish. In addition, the resin band uses soft urethane that is comfortable to wear. Evolved from the G-SHOCK original design that was born in 1983, the GW7900-1 is a discerning model that boasts technology and a high-quality finish.

Basic Information

• Case size (L× W× H) 48.9 × 42.8 × 13.5 mm
• Weight: 74 g
• Case and bezel material: Stainless steel / Resin
• Band: Resin Band
• Construction: Shock Resistant
• Water resistance 200-meter water resistance
  
• Time Adjustment: Radio-controlled Watch; Multi band 6
• Power supply and battery life: Tough Solar (Solar powered)

Exterior

• Glass Mineral Glass
• Surface Treatment; Diamond Like Coating
• Back Plate: Screw Lock Back

Watch Feature

World time

• 5 World time
• 31 time zones (48 cities +coordinated universal time), daylight saving on/off, Home city/World time city swapping

 Stopwatch

• 1/100-second stopwatch
• Measuring capacity: 00'00"00~59'59"99 (for the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes)
• Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes)
• Measuring modes:  Elapsed time, split time, 1st-2nd place times

 Timer

• Countdown timer
• Measuring unit: 1 second
• Countdown range:  24 hours
• Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)

 Alarm/hourly time signal

• 5 daily alarms (with 1 snooze alarm)
• Hourly time signal

 Light

• LED backlight (Super Illuminator)
• Full auto LED light, selectable illumination duration (1.5 seconds or 3 seconds), afterglow

Light color

• LED: White

 Calendar

• Full auto-calendar (to year 2099)

Mute feature

• Button operation tone on/off

Energy saving feature

• Power Saving (hands stop to save power when the watch is left in the dark)

Battery display/alert

• Low battery alert

 Accuracy

• ±15 seconds per month

Run time

• Approx. battery operating time: 
  10 months on rechargeable battery (operation period with normal use without exposure to light after charge) 22 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)

 Other features

• 12/24-hour format
• Date/month display swapping: 
  Day display (days of the week selectable in six languages)
• Regular timekeeping:
• Analog:  2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode)
• Digital: Hour, minute, second, pm, month, date, day

Time Adjustment Details

• Time calibration signal reception
• Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful)
• *5 times a day for the Chinese calibration signal
• Manual receive
• The latest signal reception results
• Time Calibration Sign
• Station name: DCF77 (Mainflingen, Germany)
• Frequency: 77.5 kHz
• Station name: MSF (Anthorn, England)
• Frequency: 60.0 kHz
• Station name: WWVB (Fort Collins, United States)
• Frequency: 60.0 kHz
• Station name: JJY (Fukushima, Fukuoka/Saga, Japan)
• Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga)
• Station name: BPC (Shangqiu City, Henan Province, China)
• Frequency: 68.5 kHz