Specification Model M21Viewing Angle 155° Wide ViewingNight Vision Intelligent Night Vision with white light compensationVideo Resolution 1280x720Storage Encoding H 264Storage Function Supports Cloud Storage Only Not Support TF CardBattery 4000mAh 18650×2 with 1 3 months battery life and constant temperature protectionAudio Range 5m recording rangeWireless Connection IEEE802 11b g n 2 4GHzSupported Systems Android 4 3 or iOS 9 0 and aboveUSB Interface TPC DC5V 2AWaterproof Level IP65Features 1 155° Wide Viewing Angle Provides a broad field of view capturing more of your front door area to ensure comprehensive monitoring and security 2 Intelligent Night Vision Equipped with advanced night vision technology and white light compensation ensuring clear and vivid video quality even in low light conditions 3 2 Way Audio Communication Allows full duplex audio interaction enabling you to speak with and listen to visitors in real time directly through the connected app 4 PIR Motion Supports PIR sensor and doorbell button wake up providing instant alerts to your smartphone for any detected motion or doorbell press ensuring you re always aware of activity at your door 5 IP65 WaterproofLong Battery Life Built to endure various weather conditions with an IP65 waterproof rating and powered by a 4000mAh battery offering 1 3 months of continuous use making it a reliable choice for outdoor monitoring Package Include 1 x WiFi Video Doorbell1 x Dingdong Machine1 x Ch