[MargaretR]

The idea behind this gadget is so that ladies can go to the loo in the dark, so not waking the man by putting a light on (we are considerate that way).

It is 'motion sensored' so sense her approach, and only lights when approached, so she can see whether the seat is up or down.

It prevents the risk of her backside descending into the bowl.

Ladies, if you haven't got one, just put the light on and wake him up - he might see the use of it then.