G SHOCK Full Metal 2100 Series (GM B2100SD 1C) Cole this Birkin features a structured this Birkin features a structured silhouette that maintains its shape beautifully over time Its compact design opens to a well organized interior with card slots battery operating time: 7 months on rechargeable battery (operation period with normal use without exposure to light after charge) 18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Accuracy Accuracy: ±15 seconds per month (with no mobile link function) Other features Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents afterglow) Light color LED:White Calendar Full auto calendar (to year 2099) Mute feature Button operation tone on off Energy saving feature Power Saving (display goes blank to save power when the watch is left in the dark) Battery display alert Battery level indicator Run time Approx