Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties. 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.

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. The daily alarm reminds you about recurring events with an acoustic signal at the time you have set. This model has 5 independent alarms for flexible reminders of important appointments.BATTERY LIFE - Approximately 18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)

A luminous coating provides long-term illumination in the dark after only a short exposure to light. DISPLAY ILLUMINATION - Dual Illuminator: Separate illumination of the analogue and digital components ensures optimum readability in low light conditions., LED light, Selectable illumination duration (1.5 seconds or 3 seconds), With afterglow This model has Bluetooth connectivityand can sync to your smartphonethrough the Casio Connectedapp.

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Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810. Following the debut of the original GA-2100 series — and the success it has received — Casio introduced the GM-2100 series which is an upscale metal-covered version of the CasiOak case. Like the original GA-2100, the GM-2100, which we reviewed here, doesn’t include Bluetooth or solar.