How we pick

Our recommendations are based on research, not on lab testing. This page explains exactly what that means, so you can judge how much weight to give a pick.

1. Fit comes first

Before a product is recommended for a car, we check the manufacturer's compatibility information for that make, model and year. Where trims differ, the guide says which trims are covered.

2. US warehouse stock first

Orders shipped directly from overseas can carry import duties and longer delivery times. We favor listings that ship from US warehouses and label where each pick ships from.

3. Specifications and buyer data

We compare published specifications, check whether the seller is the brand's official store, and read buyer reviews for recurring problems. We avoid listings whose claims do not match their hardware, such as cameras sold as 4K that record at a lower resolution.

4. What we have not done

Unless a guide says a product was tested first-hand, we have not handled it ourselves. Every guide ends with a note saying which applies.

5. Prices

Prices and availability are pulled from AliExpress and refreshed regularly. They can still change between updates, so the listing page is the final word.