you can't add or remove ringtones from this type of calling bells because its a single time program chip and you can't program it by your own , if you required custom ringtone you need to use audio record ic and connect that to your receiver, you need to search how to connect before you start making
Hello Is it possible to teach me please how to allow the bell to keep ringing instead of ringing only twice and stopping after pressing the bell button as I need to use it for a purpose that must keep ringing until I stop it myself with many thanks
