Try' r dewisiad yma' r "gloch weledol" ymlaen, h. y. hysbysiad gweledol y dengys bob tro byddai cloch yn canu' n arferol. Mae hyn yn arbennig o ddefnyddiol i bobl ddall.
This option will turn on the "visible bell", i. e. a visible notification shown every time that normally just a bell would occur. This is especially useful for deaf people.