IMOU Doorball 2S Video Doorbell Kit with Wireless WiFi Connection - Imou Built-in camera with 3MP 2K CMOS sensor, Supports WiFi Protocol IEEE802.11b/g/n, 2.4GHz, 2.3mm fixed lens - 30° Wide viewing angle, Built-in PIR sensor, Two-way audio (microphone / speaker), 5000 mAh battery Cloud P2P, SD slot (Max 512GB).