Simple yet stylish. NuTone wireless pushbuttons allow you to identify one door from another, by setting each button to ring to a different sound. User selectable codes prevent interference from other wireless products. These pushbuttons work with all NuTone wireless chimes.Rectangular shaped wireless pushbutton with non-stick action is designed for added durability, providing many years of service Up to two or three additional pushbuttons may be added, dependent upon chime model, so you will always know which door your visitor is at Pushbutton uses one 3-volt CR2032 battery (included) for easy maintenanceDepth: 7 8 Height: 3-3 16 Width: 1-1 4