Heath Zenith Wired Door Buzzer

Wired all-purpose enclosed door buzzer for use with (3) 9-volt DC or 8VAC to 16VAC transformer. Buzzer easily connects to new or existing wiring. For new installation, the following is required: 16V, 10VA transformer and bell wire. Push-buttons as needed, single door operation. 2.25 In. W. x 3 In. H. x 1 In. D. Weighs 0.43 Lb. 1-year warranty.