What should I do if the microphone sound is small (the other party hears small sound) when I make a call on Xiaomi Smart Kids Watch?

Please follow the following methods to troubleshoot:
1.Try to get closer to the microphone when talking;
2.Possibly the watch is wet, liquid blocking the microphone hole, or there are other objects blocking the microphone hole; if the watch is wet, please wipe the microphone hole of the watch before using it again (if the water inside the hole can't be wiped off, you can wait for it to evaporate naturally before using it again), and if it is other objects blocking the microphone hole, please remove it before using it again.