HSK 4
信号
xìnhào名
signal
山里手机信号不太好。
Shān lǐ shǒu jī xìn hào bú tài hǎo.
The mobile phone signal is not very good in the mountains.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.