1 – Ring gen2
I had this for couple years, works great (Wi-Fi) Live View with Two-Way Talk, get Motion Detection's and Alerts, Built-in Battery which Charges to USB ... (this Unit is Not Hard-Wire).
$30
2 - Ring Chime Pro
Dual-Band Wifi Extender, In-home Alerts, Built-in Nightlight.
Had it installed for about a month …. it works great no problem but wasn't going to work for where I needed to have it.
$40