A supplier audit answers one question: can the business you are contracting with actually produce the shoulder massager you sampled, at your quantity, with documents that cover it? Shoulder massagers add two audit areas most massage categories do not have: surface material control — PU color and finish are visible selling points on NM41 and NM019 — and, on dual-power models, battery and mains operation both needing test evidence.
Use this checklist to organize company information alongside product documents, so the contracting business, factory and product can be identified clearly.
Company and business identity
| Check | Questions to ask | Documents to request |
|---|---|---|
| Contracting entity | Is the seller the manufacturer, or a trading company acting for a factory? | Business license; factory address matching the license |
| Manufacturing role | Which processes are in-house — sewing, assembly, testing? | Production flow description; outsourced-process list |
| Export experience | Which markets has this category shipped to? | Export record or references for massage devices |
| Responsibility | Who signs the specification and handles claims? | Named contact with authority over quality decisions |
Surface material control (the shoulder-specific audit area)
- PU sourcing: Where does the PU come from, and how are batches checked for color, thickness and finish?
- Color management: How is a custom color (NM41, NM019 list "Customized or as picture") recorded and reproduced across production runs? Ask for the color standard system used.
- Batch variation: Request retention samples from previous runs to see real variation, not showroom pieces.
- Sewing quality: Inspect seam strength and stitching on the wearing straps and shell joins — these carry the unit's weight for the whole session.
Product documents mapped to the exact model
A document covering a different massager is not sufficient evidence for your model. For each document, check the model list, date and test scope.
- Electrical safety and EMC documents covering your model and its adapter for your market's plug standard.
- Battery documents for dual-power models (NM019, OY18NM01 — confirmed plug-in plus wireless): test evidence for both power modes, plus transport documents for lithium batteries.
- Heating documentation for NM019's hot compress: the settings, tolerance and measurement method behind the listed configuration.
- Model-mapping record: How does the certificate file's model list map to the exact configuration you will order?
Production and process controls
- Lines for this product type: Confirm the shoulder massager lines you see are the ones that will produce your order.
- Incoming control: How are PU batches, motors, batteries and controllers checked on arrival?
- In-process checks: Where are units tested — electrical assembly, before housing closure, final function test?
- Final inspection: Sampling plan per batch; treatment of failed units.
- Light-feature testing: For infrared (HT-SN061) and red light (OY18NM01) models, how is the light function verified per batch?
Questions that expose specification drift
1. Show me the sample you would ship against my approved sample — is it from current production?
2. Which document covers this exact configuration and adapter for my market?
3. If I change the PU color or packaging, which parts of the certificate file remain applicable?
4. What is your process when a batch fails final inspection?
5. Who owns the tooling, and what happens on re-orders after two years?
After the audit
Record findings against this checklist, separate blocking observations from monitoring items, and agree corrective actions with dates. Keep the audit record with the approved sample — which for these models is also the PU color and finish standard — and the written specification.
Common audit questions
Can I audit before the first order?
Yes — audits are most valuable before contracting. Ask for the document set first, then decide whether an on-site or third-party visit is needed.
What if certificates cover a family of models?
Check that your exact model and configuration appear on the scope. If only the family is listed, ask for a document that names your model.
How do I verify a custom PU color will be consistent?
Agree the color standard and tolerance on the approved sample, and ask how production batches are checked against it.
Start your supplier review with Relanovo
Request the document set for the shoulder massager model you intend to order, together with a sample and quotation. We support buyer audits with factory information and model-matched documentation.