GSTB400-1A,Amazon.com: Casio G-Shock GST-B400D-1AJF G-Steel Bluetooth Solar Watch : Clothing, Shoes & Jewelry,Casio G Shock G Steel GST B400 Series Black Round Dial Men's Watch GSTB400BB-1A,Amazon.com: Casio G-Shock GST-B400BD-1A2JF G-Steel Bluetooth Solar men Watch : Clothing, Shoes & Jewelry,Amazon.com: Casio G-Shock GST-B400D-1AJF G-Steel Bluetooth Solar Watch : Clothing, Shoes & Jewelry,