X2 Home Security Camera, 1080P 80 Degree WiFi Indoor Camera, Motion Detection, Cloud and SD Card Storage Works with Alexa

SKU: GW50.0001EU

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I think it means account email address. They might need to register/sign up as a new user so you can invite and add them using their email account. 
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Sure it will see them and catch the motion 
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He can download the app and enter the user and password 
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It will get wet...The moisture will seep inside and the life of the camera will probably shorten, really fast. I use one outside but it is under a patio cover close to the house and not open to the elements. 
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You are viewing the pics from Alarm menu. To view the actual video recordings, you need to be in the camera view then need to pull-up menu for “Playback”...You should see three arrows which us to pull up menu from camera view. Hope this helps. GL. 
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If it is connected on wifi, yes you can. 
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Nope, it’s not.