Smartphone Link feature: Mobile connection (wireless connection using Bluetooth) App connection feature: Automatic time adjustmentEasy time settingNearly 300 world time citiestime and spaceRemindingphone finder Working time: Approximate battery operating time: 7 months on rechargeable battery (operation time in normal use without exposure to light after charging) 18 months on rechargeable battery (operation time when stored in complete darkness with the power saving function on after a full charge) Bluetooth, World Time, Alarm, Date, Power save mode, Power Reserve Indication, Solar Energy Bracelet Smartphone Link feature: Mobile connection (wireless connection using Bluetooth) App connection feature: Automatic time adjustmentEasy time settingNearly 300 world time citiestime and spaceRemindingphone finder Working time: Approximate battery operating time: 7 months on rechargeable battery (operation time in normal use without exposure to light after charging) 18 months on rechargeable battery (operation time when stored in complete darkness with the power saving function on after a full charge)