Nocturnal visits to the bathroom are sometimes very irritating for both you and your spouse. Â Especially when you have to turn on the lights and have all that blinding light mess with your corneas.
Fortunately, Lavnav is a true gadget that will offer you the chance to economize and pay less on your electric bill. You just put it inside your lavatory and every time it will detect any motion, the illuminating will begin.
And the best part is that when the seat is up, the light turns red and when it goes down the light turns green.
For the price of  £16.99 and requiring only a couple of AA batteries, I believe this Lavnav is worth it.
Try it!
Source: www.coolest-gadgets.com