How to change chime on Unicom 62097?

I have a Unicom Door Chime which has the model number 62097. Does anyone know how to change the chime? There are two buttons on the back, one is mode and the other is code and then a dial for volume. Can anyone help?
Holly, July 2022


done
Contact Unicom for a copy of the instructions.

http://www.uni-com.uk.com/contact-us/

Dudhdh, July 2022