I almost threw away the mouse as I was taking 4-10 seconds to get it out of sleep mode. I finally found in the questions/answers that you need to right left click on the mouse to end sleep mode. There should have been a large note in the box. Had I reviewed this before I searched more, I would have given it 1 star. Noise: I bought this in search of a quiet keyboard and mouse. The mouse is noiseless but the keyboard is not but it is quieter than my previous keyboard. I did find a noiseless keyboard last year but the keys were extremely smooth and almost oily and my finger slid off quickly. (My cat sleeps on my desk and a lot of clicking noise keeps him awake which is not good). I give the mouse 4 1/2 stars (wish it were a little larger but noiseless and once I learned how to get it out of sleep mode it's great otherwise) I give the keyboard 3 stars - only because the seller called it noiseless - which is not true. It does not make the louder "clicking" noise of most keyboards but it works great and it is quieter than most (been using computer for over 35 years and used a lot of keyboards to I have a lot to compare to). I give the seller "0" stars - first given all the comments about how to get it out of sleep mode - there should be something large in the description or box which says left click to end sleep mode. Plus "noiseless" is wrong for the keyboard.