Have you ever heard of smart doorbell?
In terms of how you operate, there is similarity between traditional doorbell and smart doorbell: where the visitor just push on the switch button. However, there are also additional feature embedded in the smart doorbell where you can connect to a wifi network.
With this, owner of the house will be able to receive alert when there are visitors. Not only that, he is also able to see who they are and able to communicate with them! all you need to have is a smartphone. Please refer to link below for an example of the smart doorbell:
However, the downside of the smart doorbell is the cost which is pretty high at the moment, considering it is still new. Thus, many house owner still looking at conventional doorbell.
Who knows in the near future, smart doorbell will be an option? Stay tuned and doorbellsg.com will also offer smart doorbell when the time comes!