Make a digital clock out of your tablet or smartphone. It is convenient to use at night during sleep. Economically it spends the battery.
Many different settings, fonts, etc. When the charging is connected, the clock can appear on the screen.
Now the clock knows how to speak.
Also clock has stopwatch option.
The stopwatch is voiced by voice, it can be used in sports - you just need to wear headphones and turn on voice acting.