Manufacturer-documented
A dated product/manual/support-page statement exists for the exact model or clearly identified series. Every research file links to its source. We do not call this an independent hands-on test.
TRANSPARENCY / HOW THE INDEX IS MADE
Evidence, not a badge.
We distinguish subscription access, internet-disconnected operation, and survival without vendor services. These are different questions, with different proof standards.
Conditional
A function works only with added storage, a hub, power, network setup, a compatible phone, or an eligible plan. The requirement stays visible beside the finding.
Unverified
No sufficiently specific evidence was found in the reviewed material. Unknown is not the same as no. Cloud-shutdown independence remains unproven for the included models.
COST FORMULA
Estimated ownership cost, not a quote.
Buying new: purchase price + accessories + installation + applicable recurring plan charges + selected annual operating expenses. Already own: exclude past hardware, installation and accessory purchases as sunk costs; include only future fees for the current device and new costs of any replacement.
Monthly billing uses the months remaining after a free trial. Annual billing is charged in full years when an annual plan is chosen; annual charges can therefore exceed the selected horizon if a partial final year is prepaid. Tax, maintenance, electricity, upgrades and resale value are excluded unless the visitor explicitly adds costs.
Displayed device purchase prices are assumptions or time-stamped official entry prices, never real-time checkout quotes. No automatic price monitoring is deployed with this static ZIP.
Review policy
Each revision should preserve a source URL, a check date, model identifier, region and a note describing changed claims. Hands-on tests will only appear if independently completed and documented with reproducible procedures. Conflicting documentation is marked unresolved.