The programmable power saving trv for dect home networksthe comet dect is a simple and clever extension of your fritzbox home network to control radiator temperature the dect enabled wireless energy saving trv connects safely to the existing network set up is pretty straightforward and accessible from wherever you are use your smartphone laptop or tablet easy to set upremove old radiator valve check if you need an adapter attach union to tvr or adapter done comet dect is compatibl