The SkyBell does not make a buzzing sound, what you hear is the transformer for your home. If your transformer is buzzing it means that your transformer isn't able to put out enough power for the SkyBell. Please click here for a list of compatible transformers and SkyBell power requirements.
If you are trying to power two SkyBells with one transformer, the transformer must be providing 16v or greater.
If you have a non-digital/manual (ding-dong) chime, open the SkyBell app and go to the device settings menu. Confirm that the "digital door chime" is toggled to the "off" position. If it was toggled to the on position, please wait a couple of minutes after turning it off then press the SkyBell button to confirm that the 2 plungers in the chime hit their plates normally and the buzzing has disappeared. If you have an electronic/digital chime you will need a digital doorbell adapter sold on SkyBell.com.
Occasionally, with some really old door chimes, they do not regulate the power current to the SkyBell properly causing a buzzing or humming noise. If you replace the door chime this issue will be resolved. If you replace your door chime with a digital door chime please make sure you get a SkyBell digital door adapter.
Digital DoorBell Adapter Installation Video - https://www.youtube.com/watch?v=z11dfrYE5cA
Mechanical Versus Digital Door Chime Video - https://www.youtube.com/watch?v=vXfPRsuszHw