Hi
I got the videodoorbell and stickup cam already, I wanted to buy the RING contact sensor just to know if a door is open or closed.
Do I am forced to buy the hub or keypad so it could works with the contact sensors? At the end I just want to receive alerts on my phone when the door is open or closed.
Good question @AbosTechnology! The Alarm devices do require an Alarm Base Station in order to communicate. Your Base Station will connect to your home network, while your Alarm devices then communicate with your Base Station via low power frequency. Our Alarm Kits come with a Contact Sensor, Motion Detector, Range Extender, Keypad, and Base Station. I hope this helps! 