Introducing the Caution Yellow series an eye-catching black and yellow color scheme from G-SHOCK a toughness watch that has continued to evolve in pursuit of insatiable strength since its release in 1983.[ Shockproof structure & 20 ATM waterproof] Adopts a shockproof structure that is resistant to shock and vibration. - Also equipped with 20 ATM water resistance allowing use in a variety of locations and situations.[ Mobile link function] Functions can be linked with compatible smartphones via Bluetooth - R communication.[ Needle retraction function] If the needle overlaps with the LCD display and is difficult to see you can temporarily retract the needle from above the LCD display. [Other product specifications] Please check the description column - The Caution Yellow series is an eye-catching black and yellow color scheme from G-SHOCK a toughness watch that has continued to evolve in pursuit of insatiable strength since its release in 1983. The base model uses GA-B001 equipped with Bluetooth . The yellow coloring on a black base gives it a tough highly visible presence that is used to call attention to things like workwear and signs. - A cool design that will accentuate and catch the eye from casual to work styles. ・Shock-resistant structure・20 ATM waterproof function・Mobile link function (function linked with compatible mobile phones via B luetooth communication) - Needle retraction function (if the hands overlap the LCD display and are difficult to see you can temporarily retract the hands from above the LCD display)・World Time: 38 cities around the world (38 time zones automatic summer time setting function) + UTC (Coordinated Universal Time) time display home time city switching function・ Stopwatch (1/100 second (less than 1 hour)/1 second (more than 1 hour) 24 hour meter with split) - Timer (set unit: 1 second maximum set: 24 hours measured in 1 second increments)・5 time alarms/time signal・Full auto calendar・12/24 hour display switching・ Operation sound ON/OFF switching function・Date display (month/day display swap) - Day of the week display (switchable between 6 languages: English Spanish French German Italian and Russian)・Double LED light: LED light for dial (with super illuminator afterglow function afterglow time switching (1.5 seconds/3 seconds)) LED backlight for LCD section (super illuminator afterglow function afterglow time switching (1.5 seconds/3 seconds)) .5 seconds / 3 seconds) *If not linked to a smartphone it will operate with normal quartz accur..