Specifications Product Name Video DoorbellDisplay 4 3 inchViewing Angle 70°SD Card not included Maximum support 256GBNight Vision Type Infrared Night VisionPower Supply DC5V 2AStorage Encoding MJPEGOperating Temperature 10°C 60°COperating Humidity 10 90 Audio Built in speakermicrophoneWiFi Mode 2 4G Private ProtocolBattery Doorbell 800 mAh Screen 400 mAh Features 1 Crystal Clear 4 3 inch DisplayThe M17S Video Doorbell features a 4 3 inch high resolution display allowing you to see visitors in detail Whether it s day or night the screen provides a clear visual representation ensuring you know exactly who is at your door 2 Infrared Night VisionEquipped with advanced infrared night vision technology this doorbell allows you to monitor outside activities even in complete darkness Feel assured knowing you have a reliable method to see clearly at night enhancing security for your home 3 Two Way Audio Communication With a built in speaker and microphone the M17S doorbell supports two way audio communication You can effortlessly talk to visitors without opening the door adding an extra layer of safety and convenience to your daily life 4 Extensive Storage Support This video doorbell supports SD cards up to 256GB SD card not included providing extensive storage options for recorded footage It ensures you have plenty of space to keep recordings for later review offering peace of mind regarding your home security 5 Long lasting and Weather Resistant