Newbie installation help! (Nutone BK105 builder chime)

Hi everyone. I just bought a Ring 2 door bell from amazon. It's this one: [https://www.amazon.com/gp/product/B07WJR1HF8/ref=ppx\_yo\_dt\_b\_asin\_title\_o01\_s01?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B07WJR1HF8/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1) My home has a builder doorbell chime, NuTone BK105. [https://www.broan-nutone.com/en-us/product/doorbells/bk105](https://www.broan-nutone.com/en-us/product/doorbells/bk105) It was installed by the builder when I moved in. The front door button is this rounded, lighted [button](https://www.amazon.com/NuTone-PB41LBGL-Lighted-Stucco-Polished/dp/B001PO9G5A/ref=asc_df_B001PO9G5A/?tag=hyprod-20&linkCode=df0&hvadid=167135564802&hvpos=&hvnetw=g&hvrand=4920942928113813282&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032176&hvtargid=pla-309377717511&psc=1). I assume there's wiring behind of it. So there's no visible mounting screws on the button cap for me to remove. So how do I install my new Ring 2? Thanks. KB