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FeaturesIt can connect with wifi at home and achieved two-way intercom between door camera and cell phone.When Visitors press door bell .door bell sounds and meanwhile camera will start to work and send real-time video and call to smart phone .User receive the call and see the video who is outside and can Intercom with visitors and remotely unlock door etc.Wifi Video Door Phone have features such as alarm and motion detector,home security has more powerful barrier Advanced Infrared light design make users can distinguish the visitors in the evening. AC/DC power supply,eliminates the headache of frequency battery replacement. 2. 4G wifi transmission systems.realtime video transmission,Audio and video data transmission up to 100M at most. One outdoor camera can support multiple cell phone .make you see the outdoor at any time anywhere with wifi/3G/4G . APP to smart phone / tablet PC (Android and IOS) . Take photo and video on the smart phone. One doorbell supports maximum 8 smartphone. and one smartphone supports ma