The compatibility checker said my electronic chime and transformer are compatible, but the video instructions for a wired installation of the Nest Doorbell (battery) doesn't make mention of installing a diode (or not), if one comes with the chime. At any rate, I performed the installation without it and adjusted the "length of ring" setting to 6 seconds, which is nearly long enough to play through the melody, though it loses power and cuts off at the end. Any longer setting results in the chime beginning to repeat before it gets cut off which I find less desirable.