Tough Solar®
The integrated solar technology TOUGH SOLAR® puts the finishing touch to intelligent EDIFICE watches: As an independent and environmentally friendly feature, EDIFICE TOUGH SOLAR® watches are equipped with an inconspicuous solar cell on the face that stores energy from sunlight to back up the watch's power supply. Excess solar energy is stored in a rechargeable battery, providing a power reserve of up to 24 months and eliminating the need to replace batteries.