Iran has supplied Hezbollah with the Pantsir-S1 anti-aircraft system. Photo here. That is a very good weapon, the best AA Hezbollah has ever had. They also supplied them with a P-800 Oniks anti-ship missile. It looks like this.
Hezbollah already has anti-ship missiles which they used to sink an Israeli boat during a very dramatic Hezbollah broadcast at the start of the last Lebanon war.
Nasrallah was giving one of his broadcasts (the Israelis never could figure out where he was hiding) when suddenly he said, “Look above, into the sky. Watch the Israeli ship burn.” The video then panned to the sky where a missile arced across the night sky. The camera followed the missile out to sea and showed it hitting a ship and setting it on fire. Nasrallah made that announcement at virtually the very minute when the missile sunk the ship. It was the first that the world learned of the ship sinking. Nasrallah had announced the strike almost in real time. Everyone who watched was absolutely stunned. A Chinese missile was used.
It has now apparently been verified that Russia has indeed supplied Syria with two S-300PMU-1 (SA-20B) missile launchers (four battalions). Here is what they look like. It is an amazing weapon, one of the best on Earth.