Heath/Zenith SL-6167-C Heathco Sl-7367-02 Plug-in Wireless Doorbell Kit, 3 Tones, Plastic, 5-1/8 in H X 3-1/2 in W X 1-3/8 in D, White White Molded Cover Up to 100-Feet Transmission Range 8 Note Westminster or 2 Note Melody for Front Entrance and 1 Note for Rear Entrance