Again with the UL/safety excuse? What knowledge do you have to backup your claim the this is an issue? How do you know Leviton can't easily add the CentraLite sensor? Or that it's not UL certified (if such a thing even exists for these devices)? Do you work there?ano said:Actually there is. The OP II was designed to have many UL approved security zone inputs and temperature inputs and that it it. It was never designed to accept sensors outside of those. Could they start from the ground up and redesign their firmware, sure, but you never gave the economic advantage for them to do so.