Manufacturing Defect - A specific defect in the product due to which the device does not perform as per its true functionality, can be classified as a manufacturing defect. Such cases would ideally involve- one side of the earphones not working, the mic being dysfunctional, the right side producing a lower level of sound than the left one, etc.
Dead on Arrival - It is possible at times when a device has a manufacturing defect as soon as it comes out of the box. Since it is literally 'dead' on arrival, the product can be categorized under “dead on arrival”
Physical Damage - Physical damage is the damage caused to the product while using it carelessly. For eg., worn out earpads, cut wires, damage to the charging port due to using it with another charger, tugging of the wire causing it to snap or a dog biting the wire damaging it.