The doorbell youve been waiting for.N/ANest Hello lets you know whos there so you never miss a thing. It replaces your existing wired doorbell and delivers HD video and bright crisp images even at night. Its designed to show you everything at your doorstep people head to toe or packages on the ground. And with 24/7 streaming you can check in anytime. Or go back and look at a 3-hour snapshot history to see what happened.N/AN/AMakes other doorbells seem like dumbbells.N/ANest Hello can tell the difference between a person and a thing then alert you. Even if a visitor doesnt ring the bell. With Nest Aware it can also let you know if it spots a stranger or someone you know.N/AN/ASay hello even when you cant.N/AHD Talk and Listen reduces ambient noise so visitors come through loud and clear. And when you cant answer quick responses let you reply to visitors with different prerecorded messages.N/AN/AInstallation and compatibilityN/ANest Hello requires a wired doorbell chime and the right transformer.