Converting Light from Fluorescent Lamps and More
The original Casio solar-charging system reduces the need for regular battery replacement
Gallium Tough Solar
Gallium Tough Solar module: 2–5 times more efficient charging with significantly smaller solar cells
The newly developed Gallium Tough Solar charging system delivers greater durability under high-intensity lighting than conventional systems, as well as enhanced charging efficiency. When charging with sunlight in outdoor settings in clear weather (approx. 50,000 Lx), it offers charging efficiency about five times that of the previous system, and in indoor light (approx. 500 Lx), about double.* This enhanced efficiency, in turn, enables the solar module to be considerably smaller. The light shining through the cut-out gaps in the date disc is plenty to power the OCW-SG1000ZE-1A with solar energy alone.
* Based on a Casio survey, in comparison with a conventional silicone-based solar charging system with the same surface area.
Gallium Tough Solar
Gallium Tough Solar is a new solar module that represents a further advancement in the Casio Tough Solar charging system. It adapts Sharp’s gallium-based solar charging technology, which features a power-generating layer made with a gallium compound. Originally incorporated in the small SLIM lunar probe developed by the Japan Aerospace Exploration Agency (JAXA), which made Japan’s first moon landing in 2024, this advanced solar cell technology has now been effectively applied to wristwatches. The system not only delivers aerospace-level reliability, but boasts much better power generation efficiency than conventional solar cells. This allows it to use just the light shining through small gaps in the date display to reliably power all the functions, including standard time radio wave reception.
SLIM （Smart Lander for Investigating Moon）
Tough Solar
This original Casio solar-charging system employs solar panels that convert light even from fluorescent lamps and other sources, combined with an internal rechargeable battery. It generates ample power for smooth operation of power-hungry functions, from measurements to radio wave reception, Bluetooth® connectivity, lights, and alarms. Also includes a Power-Saving function that automatically engages when the watch is left for a certain period in a dark location.
Shadow-Dispersing Solar Panel
Ample power for functions such as GPS signal reception is ensured by dispersing the power generation loss due to the shadows of watch hands and so on across multiple solar cells to raise light-reception efficiency. This has also enabled the use of dimensional dials with low light transmissivity and designs with large hands and hour marks.
Solar Charging Through Inset Dials
The solar-receptive area in inset dials alone transmits enough light to power the watch, enabling face design with a greater degree of freedom.
Solar-Assisted Charging
Use USB charging for training functions such as GPS tracking and heart rate monitor, as well as smart functions such as notifications and step tracker. Time display is powered solely by solar charging, even when battery runs low.
Solar Charging
Time display is powered solely by solar charging, even when the battery runs low.
USB Charging
For training functions and smart functions, use a USB cable for charging.
Solar Charging System
Converts light from fluorescent lamps and other sources with a solar-charging system that reduces the need for regular battery replacement.