Digital watches and digital watches in the maintenance of the temperature 25 ~ 28 ℃ when a timing error in a second or less day and night, when the temperature below 0 ℃ to 50 ℃ or more, every day and night will be two seconds slower. At the same time when the temperature reaches 60 ℃, the LCD panels will be black, the temperature dropped below 0 ℃, the liquid crystal display panel will lose its effect, so that by winter, digital watches can only be worn on the wrist, by the body's thermostat to keep it the normal time. In addition, the high-temperature and over-temperature will result in battery leakage, corrosion movement. Electronic watch batteries in general can be more than a year, but the lighting power large, bright open a second with a timing of the power consumption of the equivalent of more than an hour.