The accessory can be connected to your existing doorbell chime system.
Suppresses buzzing sound that results from certain chimes used in conjunction with Zmodo smart doorbells. Compatible with all Zmodo smart doorbells. .
• Compact design
• Easy Installation
• Long Lifespan
• Reliable performance
• Weight: 2 ounces
• Package Includes: (1) Power Accessory Noise Corrector and quick start quide (DoorBell Not Included)