There are nine versions of knocks on the wooden door.

Nine versions included:
1. Knocking – 0:01
2. Knocking – 0:01
3. Knocking – 0:01
4. Knocking – 0:01
5. Knocking – 0:01
6. Knocking – 0:01
7. Knocking – 0:01
8. Knocking – 0:01
9. Knocking – 0:01

Thanks and enjoy!