40,000 LUX optical power output Our solar watch charger uses multiple UV-free LEDs, which will not fade the dial and hands of your expensive solar watch unlike direct exposure to sunlight and ensures optimal charging performance. Fits any men's or women's solar watch size compatible with all kinds of solar watches, and both male and female size solar watches can be used. Our solar watch charger has a timer off function to ensure electrical safety How to use the timing function: First you need to make sure the charger is turned on, Then touch the switch position for 3 seconds to enter the timing mode, Set according to personal habits: 6-hour timing/12-hour timing