GreenBrook DHT01AN is a dual-tone door chime with a built-in transformer and bell push. It is powered by a 240V supply and can be connected to an appropriate cable (not supplied) to the screwless bell-push terminals inside the doorchime. The bell push can be secured in its position and the doorchime front cover can be replaced. The chime should not be mounted on the door. For longer cable runs, a cable with a larger cross-sectional area is advised, e.g., 13 strand speaker flex.