This doorbell can connect to the mobile phone via 2.4G WiFi,no cable required.When a visitor presses the doorbell, the sound will be detected and the real time images and call will send to your phone through our APP.Supports two-way audio,PIR motion detection and IR night vision,better to protect your family and home. Two-way Audio 2.4G Wi-Fi Connection PIR Motion Detection IR Night Vision Low Power Consumption Easy to Set Up