Casio Men's G-SHOCK Solar Watch, Bluetooth Compatible, G-STEEL Small Model, Men's Metal Band GST-B400BD-1A2JFProduct Highlights p> Achieving further miniaturization of components and slimming down the module. While maintaining high functionality with Bluetooth and solar power, power consumption has been significantly reduced. Additionally, with the Carbon Core Guard structure, it has achieved the thinnest profile in the G STEEL series (as of December 2020). From the back to the top of the bezel, it measures 12. 9mm, making it over 1mm thinner than the GST