Does circumcision by ring suffice for the traditional circumcision, and what is the ruling of Islamic law on it, and how should the hair of a male newborn be shaved (with a razor or an electric shaver) given the tenderness of his skin?

The Sunnah (definition) is to remove the newborn's hair on the seventh day and to give in charity its weight in silver. The command to remove harm is general, so the hair can be removed by any method, whether with a razor, a shaver, or anything else that removes all the hair. The best option is to choose what is gentlest and easiest for the newborn.