Replace your old, faulty chime and be alerted to the arrival of a visitor with Extel’s Ding wired chime. Its simple two-wire installation and sober design blend in perfectly with your interior wall. Choose from two ring tones to be notified of a visit. Please note that you’ll need an external 8 to 12 VAC transformer and the call button (ref. 710803), both of which are not included.