The Mercury ILS102 is a high quality RF Modulator. It has a digital channel display, two RF connections (one in and one out) and two Scart connections (also one in and one out), this Scart connection is unusual for a RF Modulator and means that the Mercury ILS102 has Scart pass-through. It also has phono inputs which you can use instead of Scart (composite video, audio left and right). Supplied with a 1m aerial lead and it's own external power adpater. Accepts composite video input through Scart. Easy to set up, it simply plugs into the TV's existing coax/RF socket. There are channel up and a channel down switches on the front which allows the AV signal to be viewed on TV channels that you choose covering TV channels 21 to 69. The digital display tells you which channel is currently selected. This means that the output (whatever the source) can be viewed on TVs without a spare Scart socket or without any Scart socket at all.