Can send an alert when someone rings the doorbell or when it detects a person, motion or sound. Phone alerts include a picture to indicate whats happening. HD talk and listen. Hear visitors loud and clear and have a conversation through the Nest app. Or use quick responses to choose a pre-recorded message to answer visitors. HD video, day or night. Uses HDR and night vision to deliver bright and crisp images, even at night. 4:3 HD video shows people head to toe, or packages on the ground. 24/7 streaming with 3-hour snapshot history. Works with - Apple HomeKit - Google Home - iOS App - Android App Hard-Wired Bell Push & Chime 3m IR/Night Vision Range Camera Resolution: 2K 1 Melody Adjustable Volume Real-Time Viewing & Video Record Hub Not Required Works with - Apple HomeKit - Google Home - iOS App - Android App Hard-Wired Bell Push & Chime 3m IR/Night Vision Range Camera Resolution: 2K 1 Melody Adjustable Volume Real-Time Viewing & Video Record Hub Not Required