Description： 【Smart】: Doorbell APP control, intelligent working mode, portable. Light weight, easy to install and remove (support 2.4G WiFi). 【WiFi Connection】: Without cables, realizes two-way intercom between doorbell and mobile phone. Real-time mobile phone, supports two-way calls, photos, recordings, caring for your family makes you more at ease. 【Built-in 400mAh High-capacity Battery】: Combined with low-power design, the battery life is greatly improved, saying goodbye to frequent battery replacement. .