It will allow you to see what you do not hear. The blue line shows you the vibration of the vocal cords. Click on the figures. In the words on the left, the vocal cords do not vibrate for: /s/, /ʧ/ and /θ/

sue /ˈsuː/

zoo /ˈzuː/

thigh /ˈθaɪ/

thy /ˈðaɪ/

batch /ˈbæʧ/

badge /ˈbæʤ/