Probably 2/3 is the sensor and the associated lens, along with the mount and the isothermal block for them. Then the rest is split between display, case, battery and battery management and the rest of the electronics. Probably the single biggest coat after the IR block is the rest of the case, as the moulds to make them are not cheap in something that complex, and there are most likely not many units made to drop the amortisation cost of the dies to an insignificant amount. Consider car body moulds generally are used to make 100k plus units before they are refurbished. Similar cost of mould, but the production run is likely to be only 10k units of the IR camera per year, not 500k like the car. VW here in SA had to do a major refurbishing of the VW Golf tooling, as it was 30 years old, and was well worn, about 10 years ago. Those have made millions of vehicles.