It is the sound of a Peshmerga soldier filming himself and other Kurdish fighters firing at IS positions near Mosul.
In between bursts of gunfire, he is heard screaming at the militants, including threats in Kurdish to eat their eyes.
The long-awaited operation to retake Iraq's second-largest city from IS has renewed the ferocity among Kurdish and Iraqi forces.
Many are still about 30 kilometres away from Mosul itself, and it could be weeks, if not months, until they make significant progress.
Nevertheless, Iraqi army Lieutenant General Talib Shaghati says morale remains high.
"IS is collapsing. Their morale is very low. We have information that many of them are fleeing Mosul, together with their families, transporting their belongings out of the city. They are running away, trying to save what they can, because they know the liberation of Mosul is inevitable and will be sooner rather than later."
The president of the largely autonomous Kurdistan Region of northern Iraq says his troops have already retaken about 200 square kilometres from IS.
Massoud Barzani is calling it a historic day for his people and a possible turning point in relations with the Iraqi government.
"I would like to appreciate and congratulate the Iraqi army and the Peshmerga for all the heroic operations they did today. This is the first time the Peshmerga forces and the Iraqi army have mixed and shared in the battlefield against this terrorist organisation. We feel this is going to be a good start for the future for a better relationship between both sides."
But the recaptured land is still disputed between Iraqis and Kurds, and Mr Barzani's government has already indicated it does not plan to surrender it easily.
That is just one of many issues that still await the fighters, even if the offensive is successful.
While a United States-led air campaign has helped drive IS from much of Mosul, up to 8,000 of its fighters are believed to remain in the territory.
US army Lieutenant General Stephen Townsend says coalition forces will continue to provide support in the area but Iraqi forces will spearhead the battle.
"Iraq is supported by a wide range of coalition capabilities, including air support, artillery, intelligence, advisers and forward air controllers. But, to be clear, the thousands of combat forces who will liberate Mosul are all Iraqis."
Turkey is determined to get involved, though.
Turkish troops have been stationed just north of Mosul for over a year, training local militias to fight IS, which the Iraqi government sees as a breach of its sovereignty.
But Turkish president Recep Tayyip Erdogan has warned Iraq for some time that placing a majority Sunni region under Shiite militia control would mean more violence.
"The operation in Mosul has started. And what do they say? 'Turkey shouldn't enter Mosul.' How can I do that? I share a 350-kilometre border with Iraq, and I'm under threat from that border. Countries with no shared border with Iraq are intervening, saying they received an invitation from Baghdad."
That veiled reference to the United States has done little to slow the US involvement.
Pentagon press secretary Peter Cook says the signs so far near Mosul have been encouraging.
"Early indications are that Iraqi forces have met their objectives so far and that they are ahead of schedule for this first day. This is going according to the Iraqi plan, but, again, it's early and the enemy gets a vote here. We will see if ISIL stands and fights. We are confident no matter what, however, that the Iraqis have the capabilities to get the job done, and we stand ready to support them along with the rest of the coalition. It is in our interests that they succeed, and we will do what we can to help them."
European Union foreign affairs representative Federica Mogherini shares those sentiments.
"First of all, the Iraqi authorities have our full support. Also, the Iraqi people, in this difficult time. And we will need to work on prioritising protection of the civilian population of Mosul and, also, on the full respect of international humanitarian law."
The battle is expected to displace many of the one million people still living in Mosul, and aid agencies have been preparing for the worst.
Before the offensive against IS, or ISIL, was launched, medicine was already in short supply in Mosul, and food prices had risen sharply.
The United Nations' humanitarian coordinator in Iraq, Lise Grande, says she fears many will try to leave the city and will place themselves in great danger.
"Civilians are at extreme risk from crossfire, from possible artillery barrage. We understand that ISIL has booby-trapped large parts of the city. We understand that there's extensive contamination by explosive hazards. We're very worried about snipers. Also, in a worse case scenario, we can't rule out the possibility that there might be a chemical weapons attack. We also fear that ISIL, as they did in Fallujah, may try and hold civilian populations either as human shields or forcibly expel huge numbers of civilians in the face of an attack by Iraqi security forces, knowing that the Iraqi security forces will not fire on their own people."
