A product with some smart electronics that does what it says on the tin. The switch simply replaces your old one, just two wires. The switch is controlled by setting dip switches and two dials, one a timer and the other a daylight sensor or you can control with the included remote.
Setting the switch is a little fiddly, but with perseverance (and the different light levels in the room) you can get it to work very efficiently.
Other features include a mood setting, security setting (have the lights come on at times), a night light.
The only complaint I have is the high delivery charge of £10. This should have been delivered next day at this rate, i had to wait 5 days, 3 working days and a weekend before it was delivered.