The GST-B100D comes with a simple stainless steel band, while the GST-B100 features a solid case and urethane band.

• Smartphone Link Functions, (about 300 World Time cities, alarm, timer, hand alignment correction, home city time swapping, phone finder)
• Battery level indicator
• New layer guard structure
• Tough Solar
• Dual dial world time (Simultaneous indication of current times in two locations.)
• High-brightness LED light
• Case / bezel material: Resin / Stainless steel
• One-touch 3-fold Clasp
• Solid Band
• Stainless Steel Band
• Shock Resistant
• Neobrite
• Mineral Glass
• Screw Lock Crown
• 200-meter water resistance
• Solar powered
• LED light (Super Illuminator), Afterglow
• Mobile link (Wireless linking using Bluetooth¶ôÇï¶ô¶÷)
• Dual time (Home city time swapping)
• 1-second stopwatch, Measuring capacity: 23:59'59, Measuring mode: split time
• Countdown timer Measuring unit: 1 second, Countdown range: 24 hours
  Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
• Daily alarm
• Battery level indicator
• Power Saving (hands stop to save power when the watch is left in the dark)
• Full auto-calendar (to year 2099)
• Date display
• Day indicator
• Regular timekeeping Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)
• Accuracy: ¶ôÇïÇ?Çñ15 seconds per month (with no mobile link function)
• Approx. battery operating time: 5 months on rechargeable battery (operation period with normal use without exposure to light after charge), 24 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
• Size of case : 58.1 x 53.8 x 14.1mm
• Total weight : 185g