They had transporter technology and possessed voice duplicator equipment at least good enough to fool a casual listener.
Gorn ground tactical units utilized powerful disruptors, capable of completely disintegrating targets at ranges of between 1,200 and 1,500 yards. Their sensor technology may have been less effective than that of the Federation, as they had some difficulty targeting the landing party during their ambush at Cestus III.
They were able to home in on signals from a tricorder, allowing them to "bracket" the user with fire. （TOS: 怪獣ゴーンとの対決）