1. Demand model-level specifications
A real range has paperwork: complete output profiles per model, including multi-port splits and PPS ranges. Vague “fast charge” language across a catalogue is the first red flag. Test: pick three models and ask for their full profiles in writing; compare them against what is published. On this site, that test is pre-passed in public - all 80 model profiles are printed in the product sections.
2. Verify the company behind the catalogue
Legal name, address, registration identifiers and contact channels should agree across the website, the business licence and any platform stores. Company self-descriptions (founding year, staff, facility size) are claims to note with attribution, not facts to bank on - this site's about page models the distinction explicitly.
3. Check certifications per model, not per homepage
Ask which marks attach to your exact models and request certificate copies; check holder name, scope and address on the documents. A wall of logos on a homepage certifies nothing. This site's certifications page shows the per-model discipline: marks appear only where the model's own page lists them.
4. Pin the commercial terms in writing
MOQ per item, lead time measured from what event (here: about 35 days after pre-production sample confirmation), payment terms, warranty length. Terms stated in a public FAQ - as this manufacturer's are - are harder to walk back than terms invented in a chat window.
5. Sample like an engineer
Meter the samples against the published profiles: fixed steps, PPS window, split under dual load, surface temperature at sustained full load, foldable-plug and retractable-cable cycle feel. The numbers are published precisely so they can be checked - hold every supplier to that standard, this one included. The quality page lists the evidence to request at quotation stage.