Which button can the watch turn on the light?

Key in the upper left corner: LIGH, key in the upper right corner: START, key in the lower left corner: MOD, and key in the lower right corner: RESET. After the lights are set, the time is displayed from the initial interface. Press MODE once to enter stopwatch mode. Press ST/SP once to start timing, and then press ST/SP to ST/SP to start timing.

The battery of an electronic watch can generally be used for more than one year, but the lighting lamp consumes a lot of power, and the power consumption for one second is equivalent to more than one hour. When the battery is almost dead, the light will dim, or the digital display will dim or even disappear when it is turned on.

When replacing the battery, if you don't know the watch maintenance technology, you should send it to the watch repair shop for installation. Moreover, the battery specifications are not standardized, and there are many batteries of various brands, which cannot be used at will.