Hum sound battery doorbell

Hi all, i purchase the video doorbell(battery) a couple days ago. I wired it to mu transformator 16volt but i hear when i watch the clips ans live vieuw a hum sound. I looked it with the tuturials if i did something wrong but I could find it

Regards buyer from Holland

If the doorbell is making the humming sound then it might be because the power supply isn’t enough. You may have to try another Transformer. Try getting a 18v one.