Vintage Basic (ABL 100WE 1BDF) Attesa With two interlocking Gancini symbols With two interlocking Gancini symbols The Rolex Datejust 31 (Model 278341RBR) blends Swiss precision with classic elegance by display and beep） Step count graph（Hourly step count for the past 7 hours on a 6 level graph） Smartphone Link feature Mobile link (Wireless linking using Bluetooth®) Apps CASIO WATCHES App connectivity feature Auto time adjustment Easy watch setting Approximately 300 world time cities Life log data Time & place Phone finder Compatible band size 145 to 205 mm Light color LED:Amber Mute feature Button operation tone on off Energy saving feature Power Saving on off Battery display alert Low battery alert Other features 12 24 hour format Regular timekeeping: Hour lap split times) Timer Countdown timer Measuring unit: 1 second Countdown range: 60 minutes Countdown start time setting range: 1 second to 60 minutes (1 second increments and 1 minute increments) Alarm hourly time signal 5 daily alarms Hourly time signal Light LED backlight Selectable illumination duration (1