I have been very satisfied with this Air Wick product. It is just the right size to be placed on a desk or counter top without taking up too much space and doesn't require an electrical outlet. It uses 2 AA batteries which are included. Now there's something you don't see much anymore...batteries come with it. The instructions were so simple they were just printed on the side of the box with nice, clear pictures incase you had a problem. You just take it out of the box, pop in the aerosol refill, set the timer and you're done. You can set the timer for 7.5, 15 or 30 minutes and at the interval you select the unit will release a small, and almost silent, burst of fragrance. If you require a bit of frangrance before the next timed burst, just press the button on the side of the unit. I keep mine on the desk top next to my work station but it would work well in the bathroom too or any other room in the house. I have noticed that just one of these mini units scents two average sized rooms but, of course, that might be affected by heating or air conditioning vents in the area or open windows. I highly recommend this product.