First, it's a great product (supplied with 2 keys) that I use for my personal computer at home. My peace of mind is assured, it is priceless, I should put it 5 stars, but: - It is sent rough around the edges from the United Kingdom in a padded envelope without operating instructions or delivery - Be able to record on the Kensington website the serial number of the 2 keys to repeat the power in case of loss is great, but I gave up because after multiple attempts and infuriating waste of time I always arrive the same result: "Sorry, there has been a problem with the web page, we are working to solve the problem." So 3 stars instead of 5 Kensington assured if he deserves more ...