The USS Voyager first encountered a Hirogen ship in mid-2374, when they accessed the Hirogen communications network to receive the full message from Starfleet Command. Tuvok and Seven of Nine were hunted down and held as prisoners aboard this ship until Idrin told his Beta-Hirogen to kill their prey. (VOY: "Hunters")
They were described as having "massive weapons", including phaser banks. (VOY: "Hunters", "Prey", "Flesh and Blood") Their weapons range of at least 50,000 kilometers. Among their tactical abilities was that of being able to disable other vessels with a type of subnucleonic beam, as well as a type of stun beam. (VOY: "Hunters")
These ships generally traveled alone or in small groups, and would occasionally join forces with several others in a multi-pronged attack. (VOY: "Prey") Several of these ships together were able to defeat an Intrepid-class starship. (VOY: "Hunters", "Prey", "The Killing Game")
Beyond the bridge was a large room with another console. The walls contain trophies and bladed weapons. Also included in this area was technology for producing relics of their prey, including a harness-like construction to hang their prey on while preparing an osteotomy, and large transparent cylinders with fluid in which an enzyme could break down their prey's tissue. (VOY: "Hunters", "Prey")
Ships of the class
According to the script for "Hunters", this vessel was "[a] mean-looking ship, bristling with weaponry."
In Star Trek Online, these vessels are identified as "Hunter Escorts".