Received in a cardboard packaging different one in the photo, but the product was of course there with its accessories and instructions. Specifically, I had to pull a tab and presto, it is activated until 2021. There is a button to test the alarm. There you go. Obviously I have not tested in real conditions (warning: never do, carbon monoxide is deadly - without prejudice!). As it is a carbon monoxide detector rather popular, I read many positive reviews on Amazon's website in the UK (www.amazon.co.uk), so I am reassured. He noted that seven years of battery life for this type of product, it's huge - my previous had only three. In short, for now, I'm very happy with this purchase. In addition, the price is reasonable (I paid 22.70 euros, when seen sometimes more than 40 euros elsewhere and competing products are sometimes more expensive - the only other competing product that seemed well was that of Ei Electronics). A little effort was also made to the design is always a plus, although not essential.
