Technician is a Unique Survivor Perk . It is unique to Feng Min(凤敏) until Level 30, at which point its Teachable version can then be learned and taught to the other Survivors.
The Generator explosion prevention will also work on Skill Checks created by Overcharge , allowing for stealthy triggering of damaged Generators if need be, albeit dependent on the Player's luck.
The reduction in repairing sound effectively forces the Killer to be standing very close to a Generator to hear anything. This can be used to "tap" damaged Generators to prevent their regression without alerting the Killer, or resume repairs immediately after a Killer damages it (when they would least expect it).