In general, calculators have a continuous addition function and the methods are basically the same. The first is to continuously press the numbers and + signs, for example 45+69+35+298+558=, then press the equal sign at the end. Another method is to use the M+ storage key (or mark other symbols). Before adding, clear the storage to 0 (MC), then you can add continuously. For example, 58M+65M+425M+85M+ When finished, the saved result will be displayed and press MR.
2-5 hours
Under direct sunlight of 5,000-10,000 lumens, it can be fully charged in 2-5 hours. The battery life of light-powered watches is typically 10 to 12 years. When fully charged (shown H), it can work normally in the dark for about 6 months. In power saving standby mode, it takes about 16-20 months. Watches with retroThe lighting will be displayed based on the backlight usage rate. Operating time can be reduced if necessary