Electronic video-intercom is the best system to connect private house and communities because the video signal shows images and you could or not get communication.
Electronic video-intercom is composed by an outside device with a camera with audio and a inside device with a screen and phone.
You could connect the system to the pedrestian gate and to the garage gate, too. You could open each gate and you could connect a card sensor, keypad to outside device.
ELECTRONIC VIDEO INTERCOM
Electronic video-intercom with call forwarding to mobile phone and WIFI integrated in colour screen, to private houses. It´s composed by a video device, power supplier and a colur sreen. You need 2.4GHz WIFI.