Casio G-SHOCK G-STEEL GST-B100 Series Bluetooth Watch (GST-B100D-1AER)

Overview

The Casio G-SHOCK GST-B100D-1AER is a G-STEEL model featuring an analogue chronograph design with a stainless-steel bracelet and a dial motif inspired by heavy jet engine blades. A rotating disc at 9 o’clock supports multiple functions, including display indications for stopwatch operation and battery level. The layer guard structure and high-density mounting technology help improve wearability, while Bluetooth® connectivity enables accurate time acquisition via a smartphone. Tough Solar power supports stable operation, alongside practical features such as high-brightness LED illumination and dual-time display.

Key Features

• Shock-resistant construction with layer guard structure
• 200-metre water resistance
• Tough Solar (solar powered)
• Bluetooth® Smartphone Link with automatic time adjustment
• Dual time with home city time swapping
• Screw lock crown
• Battery level indicator and Power Saving function
• LED light (Super Illuminator) with afterglow
• Full auto-calendar (to year 2099)

Specifications

• Case size (L×W×H): 58.1 × 53.8 × 14.1 mm
• Weight: 185 g
• Colour: Steel with Black dial and Steel strap
• Casio Part Number: GST-B100D-1AER
• Case and bezel material: Resin / stainless steel
• Band: Stainless steel solid band with one-touch 3-fold clasp
• Glass: Mineral glass
• Construction: Shock resistant
• Water resistance: 200-metre water resistance
• Time adjustment: Bluetooth® (connects to a smartphone and automatically adjusts the time)
• Power supply: Tough Solar (solar powered)
• Other: Neobrite; screw lock crown

Smartphone Link & App Connectivity

• Smartphone Link feature: Mobile link (wireless linking using Bluetooth®)
• App: CASIO WATCHES
• App functions: Auto time adjustment, easy watch setting, approximately 300 world time cities, phone finder

Watch Features

• World time: Dual time (home city time swapping)
• Stopwatch: 1-second stopwatch; measuring capacity 23:59'59; measuring mode: split time
• Timer: Countdown timer; measuring unit 1 second; range 24 hours; start setting 1 minute to 24 hours (1-minute and 1-hour increments)
• Alarm/hourly time signal: Daily alarm
• Light: LED light (Super Illuminator) with afterglow
• Light colour: LED: White
• Calendar: Full auto-calendar (to year 2099)
• Energy saving: Power Saving (hands stop to save power when left in the dark)
• Battery display/alert: Battery level indicator
• Run time: Approx. 5 months on rechargeable battery (normal use without light after charge); approx. 24 months in total darkness with Power Saving on after full charge
• Accuracy: ±15 seconds per month (with no mobile link function)
• 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)
• Additional display: Date display; day indicator

Authorised Casio Retailer

TacTree is an authorised Casio UK retailer. All Casio watches sold are 100% genuine, brand new and supplied directly to us from Casio UK. Each watch is delivered with official Casio packaging, instruction manual and manufacturer warranty, ensuring complete authenticity and peace of mind.