CASIO · JAPANESE-MARKET REFERENCE

MTG-B4000B-1AJF

Name: MTG-B4000B-1AJF
Brand: CASIO
SKU: MTG-B4000B-1AJF
Price: 183540.0 JPY
Availability: OutOfStock

¥183,540 JPY

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The MTG-B4000 combines a carbon-and-stainless-steel frame with a Dual Core Guard structure developed using AI and accumulated shock-resistance data. Layered carbon and glass-fiber sheets are machined into a complex three-dimensional frame. Hairline and mirror finishes contrast on the black ion-plated steel bezel, while an MIM-formed metal case back provides sculpted protection. Red accents on the carbon frame and dial pair with a flexible, durable soft urethane band. CASIO WATCHES connectivity supplies time information, alongside Multi Band 6, Tough Solar and a bright LED light.

Reference: MTG-B4000B-1AJF
Case (H × W × D): 56.6 × 45.3 × 14.4 mm
Weight: 112 g
Listed water resistance: 20-bar water resistance

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Before & after your purchase

Read our shipping and return information before ordering. Model-specific warranty and repair guidance is available below.

Buying from Japan Size & function guide

Setup & support

Model reference: MTG-B4000B-1AJF

Search the official manual using this model or the module number on your watch.

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Before you choose

Warranty & service

Local warranty service outside Japan is not guaranteed. Read our return and repair policy and ask about your exact reference before ordering.

Bracelet fit & adjustments

Check the case dimensions and band details in the specifications. Ask us about fit, included links and adjustment options before placing an order.

Packaging & included items

Included items can vary by reference. Contact us with the model number to confirm the box, documents and accessories.

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Product details

Model: MTG-B4000B-1AJF
JAN / EAN: 4549526423918
Band material: Resin band
Crystal material: Sapphire crystal
Weight: 112 g
Case size (L × W × H): 56.6 × 45.3 × 14.4 mm
Price: ¥183,540 JPY
Country of origin: JP

Specifications

Release date	May 2026
Case size (H × W × D)	56.6 × 45.3 × 14.4 mm
Weight	112 g
Case and bezel material	Carbon-fiber-reinforced resin / stainless steel
Band	Resin band
Construction	Triple G Resist: resistance to shocks, centrifugal force and vibration; Carbon Core Guard structure
Water resistance	20-bar water resistance
Time adjustment	MULTIBAND 6 radio-controlled timekeeping: Japan, North America, Europe and China; Bluetooth: connects to a smartphone for automatic time adjustment
Power supply and battery life	Tough Solar (solar charging system)

Exterior details

Glass	Sapphire crystal with anti-reflective coating on the inner surface
Crown	Screw-lock crown
Surface treatment	Black ion plating (bezel)
Compatible wrist size	145–215mm
Other features	Neobrite

Watch functions

World time	World time: 27 cities (38 time zones, automatic daylight saving adjustment) plus UTC (Coordinated Universal Time); home city / world time city swapping; May be updated through smartphone connection.
Stopwatch	Stopwatch: 1 second, 24-hour capacity
Timer	Countdown timer: 1-minute setting increments, maximum 24 hours, 1-second measurement
Alarm	Daily alarm
Light	LED light: Super Illuminator, afterglow
Light color	LED: white
Calendar	Full auto-calendar
Hand position correction	Automatic hand position correction
Power saving	Power saving: stops the hands after a period in the dark
Battery indicator and alerts	Battery level indicator
Operating time	Operating time from a full charge without solar generation: approximately 5 months with normal function use, or 18 months in power-saving mode
Accuracy	Without radio reception or smartphone synchronization, the watch runs at normal quartz accuracy of ±15 seconds per month on average.
Other features	Date and day display
Time calibration details	Automatic radio reception up to six times daily (five for the Chinese signal). Signals: Japan JJY 40/60 kHz (Fukushima and Kyushu), North America WWVB 60 kHz, Europe MSF 60 kHz / DCF77 77.5 kHz, China BPC 68.5 kHz. The station is selected according to the configured home city or time difference. Supported home cities: Tokyo, Los Angeles, Denver, Chicago, New York, Halifax, London, Paris, Athens, Hong Kong. Japan uses JJY, North America WWVB, Europe MSF/DCF77 and China BPC.
Mobile Link	Bluetooth connectivity with a compatible smartphone
Compatible app	CASIO WATCHES
App functions	Automatic time adjustment; Easy watch settings; World time: approximately 300 cities; Time & Place; Watch status display; Self-check; Phone finder