Start with the model, not the shape.
Remotes with similar-looking buttons are not necessarily interchangeable. The opener model and the remote details are more useful than colour or appearance. If you can safely read the label, include that information with your enquiry. Explain whether a remote has been lost, stopped responding or is simply needed for another household member. Those are different situations and may call for different next steps.
Lost remote? Think beyond replacement.
When an access device is missing, discuss whether the old device can still operate the door and how the specific system manages its stored controls. A replacement handset alone may not address the access concern. If you have recently moved into the property, it is also useful to review which remotes and other controls are in use. Keep changes coordinated so the household knows which devices will work afterwards.
Keep everyday access straightforward.
Think about who needs access and how they will use it. A household may prefer a simple remote for daily driving and an additional compatible control for another entrance. Ask what happens if the internet is unavailable and which functions remain local to the opener. At handover, keep the model and setup information, understand the supported controls and manage account access carefully where an app is involved.