Out of 6 room sensors that I ordered, 2 were faulty. With both, the batteries leaked and made the sensors non-functional. While the service was good and I got a redelivery of replacement sensors promptly, I was deeply disappointed with the quality of the product and with the lack of minimal quality assurance. It makes we feel uncomfortable with future purchases of Sensibo products, as well as concerns as for the quality of the other products that I've already purchased.