ALARM FUNCTION - 5 Daily Alarms: Each will sound every day at the time you set, Hourly time signal: The watch beeps every hour on the hour The watch is equipped with energy-saving Bluetooth® technology, which offers power-saving data transfer at the push of a button. The watch can connect to a smartphone wirelessly via Bluetooth®, enabling access to a wide range of useful functions. This model has Bluetooth connectivityand can sync to your smartphonethrough the Casio Connectedapp. Functionally, the GA-B2100 comes with the usual plethora of features, all while keeping the dial relatively minimalistic, which is preferable for me because too much going on takes away from legibility and usability.

And crucially, the addition of Bluetooth and solar, added no weight or size to the watch, meaning the GA-B2100, has the same case dimensions of 45.4 mm diameter x 11.8 mm resin case (48.5 mm lug-to-lug) and still weighs 51 grams — just like the original GA-2100. Approximately 18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, split time, 1st-2nd place times, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes)

Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, lap time, split time, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810. Misplaced your smartphone? All it takes is the push of a button on your watch and the smartphone sounds an alarm. Invisible solar cells in the watch convert light into energy and supply all functions. A rechargeable battery provides the necessary capacity for operation in poor light conditions.STOPWATCH FUNCTION - Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, lap time, split time, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) With a push of a button, hands are moving and permit a free visibility of functions like stopwatch or date.