Structure: Shock-resistant structure Water resistance: iso standard 200m diving water resistance Communication Specifications Communication standard: Bluetooth low energy Communication distance: up to 2 m (varies depending on environment) Radio reception: jjy (Japan): 40 kHz (Fukushima station) / 60 kHz (Kyushu station), wwvb (USA): 60 kHz, msf (UK): 60 kHz, DCF77 (Germany): 77.5 kHz, bpc (China): 68.5 kHz Radio reception: Automatic (max. 6 times/day, max. 5 times/day for China), manual Diving function: Dive time measurement (up to 2 hours, measured in 1-second increments), surface rest time display (up to 24 hours), dive log acquisition (up to 30 logs) Tide graph: ebb and flow of tide: 6-level display Stopwatch: 1 second, 24-hour counter Mobile link function (Automatic Connection, function linkage via Bluetooth communication with compatible cell phones) Automatic time correction, easy clock setting, world time: approx. 300 cities, dive log, tide graph setting (approx. 3,300 points worldwide), cell phone search, watch status display, self-check, Premium Production Line production certificate*. Premium Production Line production certificate is displayed in the application. Other functions Automatic hand position correction function, hand evacuation function, dual time (27 time zones, with automatic daylight saving time setting function, with time switching function with home time), power saving function, date and day display, fully automatic calendar, led light (with super illuminator and afterglow function) Power source: Tough Solar (solar recharging system) Continuous operating time: Operating time without solar power generation from the time of full charge When using functions: Approx. 5 months In case of power saving state: approx. 29 months Size: 56.0 x 49.7 x 18.6 mm Weight: Approx. 132 g.