These handy little boards are designed to fit inside most common SCART cables and convert composite video to clean sync. Ideal for users of monitors or RGB switches (such as an Extron Crosspoint) that require a clean sync signal, or for XRGB3 users. These sync in SCART boards are much cheaper and much tidier than buying an external sync cleaner such as a Sync Strike. For full fitting instructions see this page.
As seen and briefly reviewed on mmmonkey.co.uk (scroll to the bottom of the page).