Covenant Weapons Holder
From Halopedia, the Halo wiki
The Covenant Weapons Holder has appeared throughout the Halo series as a device that has stored the weapons for Covenant encampments. It holds four hand held sized weapons, or two two handed weapons. It has been speculated that it also acts as a device to recharge plasma based weaponry, as all weapons found in it have been fully charged, but this may just be circumstantial.