we'd like to ship worldwide.
For a commercial product, this is quite an effort.
Check validity of the software&hardware licenses - there are so many patents involved, which may or may not have been cleared in all countries. For small production numbers, this might run under the radar and I would neglect it for now.
Check for emissions and safety - a self declaration is probably good enough for Europa, likely not possible in many other countries.
Waste a lot of money on waste licensing. Not sure how this is handled outside Europe, but for Europe, it has become beyond crazy. And crazy expensive for registration alone, expect a good 4-digit amount per year, without even selling one item.
Consider shipping Lithium-cells containing devices to be very expensive locally or even impossible overseas (unless shipping by container). Just design to use a replaceable AAA battery or two and don't include them.
Unless you intend to sell tens of thousands of units, I would keep it as a hobby, that keeps things waaaaay easier.