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Amazon.co.jp: Casio GMW-B5000 Series G-Shock Wristwatch, Bluetooth, Radio Controlled Solar, gold (stainless steel), Wristwatch, shock-resistant construction, radio wave solar, smartphone link function : Clothing, Shoes & Jewelry
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Amazon.co.jp: Casio G-Shock x Baby-G Watch Pair Watch with Time Correction Function, Bluetooth, G-STEEL & G-MS, black/gold : Clothing, Shoes & Jewelry
CASIO G-SHOCK PH - Function-wise, this model employ Bluetooth® technology to allow access to a smartphone's GPS for quicker calibration of distance measurements. Once calibration is done, the watch is able to
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