DOORBELL CHIMES AND BUTTONS: this transformer is ideal for any wired doorbell chime and wired doorbell button (sold separately). SPECS: Input: 120VAC/60HZ; Output: 16VAC/30VA. COMPATIABILITY: you can use this transformer with wired video doorbells to ensure the safety of your home. MOUNTING INFORMATION: mounts on all junction boxes to use with any wired doorbell chime and buttons. WARRANTY: this transformer box is guaranteed with a 1-year limited manufacturer's warranty. TRANSFORMER STYLE: locknut type. EASY INSTALL: instructions enclosed for easy installation - when in doubt, contact a qualified electrician to help install your transformer