MANUFACTURING / JAPAN SOURCING

A certified wireless module still needs a host-product review

For a US-bound device using KAGA FEI WKR612AA1, begin with the module documents and the proposed installation. The module’s certification is part of the evidence; it does not by itself approve the finished product.

Fix the country and exact module first

Consider an indoor controller planned for the United States, with WKR612AA1 on its board. KAGA FEI’s datasheet identifies FCC ID 2A6NFWKR612.[1] That is a manufacturer-listed identifier to match to the applicable authorization and integration documents, not a release decision for this hypothetical controller.

This example covers the module-to-host questions for this model and destination. If you change the module variant or selling country, obtain the corresponding evidence rather than carrying this example across unchanged.

The host contains more than the radio module

1Module: exact identity, firmware and authorization conditions
2Installation: antenna, board position, enclosure and other radios
3Host review: intended use, evaluation, labels and instructions

A review boundary for a hypothetical US-bound controller. No completed host design, test result or sales approval is represented.

Match the antenna and its installation

KAGA FEI’s public Radio Law FAQ directs users to the module documentation for approved antennas and notes that other radios can require additional evaluation.[3] Collect that evidence for the exact model and destination. Separately, plan communication-performance testing in the intended enclosure; a certification reference is not the test result for your installation.

Record the antenna model, connection, placement and surrounding materials. Compare the proposed arrangement with the module’s instructions. Ask the module supplier and responsible laboratory to assess differences before treating an antenna substitution or enclosure change as covered.

Read the conditions for this module, not a general rule

The US section of the WKR612AA1 application note gives conditions concerning firmware, channels, co-location and the installation’s separation from a person. It specifies a 20 cm minimum separation in that document.[2] That figure belongs to this module’s instructions; it is not a universal distance that approves every wireless product.

If the intended use places the controller closer to a person, or adds another transmitter, flag the difference explicitly. Ask the responsible specialists what assessment or authorization work is needed for that configuration. Do not change a label in place of resolving a technical condition.

Match the proposed host to the evidence
Host information	Collect the relevant evidence	Leave the decision visible
Module and firmware	Exact part/revision, released software and applicable instructions	Which differences from the documented configuration remain?
Antenna and enclosure	Model, connection, location, enclosure and layout	Is this combination covered; what performance testing remains?
Use and other radios	Person separation, operating modes and co-located transmitters	Who evaluates the proposed final configuration?
Market and documentation	Destination, authorization identifiers, labels and host manual	What host-level work and release decisions remain?

Module evidence and host evidence serve different purposes

The US modular-transmitter text addresses antenna approval, manufacturer instructions and identification, and requires applicable RF exposure compliance in the final configuration.[4] Module paperwork should therefore be read with the proposed host arrangement, not filed as a standalone answer to every product requirement.

Have the responsible compliance team identify the applicable host-level evaluations and documentation for the complete controller. Keep radio integration, other emissions, product safety and market-access questions assigned to their relevant owners. This article does not determine the complete legal requirements or authorize sale of a particular product.

Keep the reviewed configuration through procurement

Retain the module and antenna references, firmware version, approved layout/enclosure, intended use, reports and the host label/manual revision. Ask which changes require review before procurement or production. A repeat order should refer to that configuration, not just “the certified module”.

Check origin separately where it matters to the purchase. This datasheet lists Thailand as the module’s country of origin.[1] Buying from a Japanese supplier does not itself establish Japanese manufacture. Keep origin requirements and the technical integration review as distinct questions.

Questions to send your supplier

Open supplier questions

Destination: United States
Host product, intended use and operating modes:
Module: WKR612AA1; exact hardware/firmware revisions under review:
Authorization and integration-document references:
Antenna model, connection, location and enclosure/layout:
Person separation and other transmitters:
Please identify deviations from the module instructions and the host-level evaluations still needed.
Assign the decision owners and required evidence for tests, labels and host instructions.
Quantity, timing and any origin requirement:

Save questions ↓

Sources

KAGA FEI — WKR612AA1 datasheet v1.5, 4 Feb 2026
Identification and general information on printed page 4, including manufacturer-listed FCC ID and origin. FCC grant database status was not independently verified.
KAGA FEI — WKR612AA1 application note v1.1, 14 Sep 2026
US Regulatory Information, printed pages 24–27, and mounting discussion. Used only for this module’s instructions, not a universal distance or approval rule.
KAGA FEI — Radio Law FAQ v1.2, 24 Mar 2026
General questions 1-6 to 1-9 on module conditions, approved antenna combinations and other radios. Country-specific decisions still need the model documentation.
eCFR — 47 CFR 15.212 Modular transmitters
Current electronic text, displayed through 20 Oct 2026; antenna approval, instructions, labelling and final-configuration RF exposure clauses. Not a complete market-access review.