An Enertron is a device that restores a character's Hit Points and Magic Points in Chrono Trigger. The characters step inside and activate it. HP and MP are restored within seconds. It can only be found in 2300 A.D.
Upon their arrival in 2300 A.D., Crono and his party come across a few Enertrons along their journey across the Northeastern continent. They find out that that's how the people living in the Domes have managed to survive without food and water. They also find one in Proto Dome where they discover Robo.
The following is a list of the Enertrons located around the World Map in 2300 A.D.