Yes, you can use 4 or 8 rechargeable AA batteries as backup. 

After the mobile phone and the device are successfully connected, as long as the device is in the WiFi area where you are connected, your mobile phone can remotely view the device data through the APP as long as it is connected to the Internet. Please pay attention to ensure that you are using 2.4GHz WiFi when connecting, and the WiFi area where the device is located has a strong signal to avoid accidental disconnection due to weak signal. Hope this information is helpful to you. 

You can view photos and videos from this WiFi trail camera without removing it from the mount. And you can set the camera in the APP. This is very useful for cameras mounted in high places or hard-to-reach places. 

Hello, this trail camera can provide 4K video and 30MP photo. It's clear enough to see what you're shooting with this hunting camera. So you get clear images even in the dark. More importantly, this hunting camera has WiFi connection and APP control. That means you can use the APP to preview and download photos on your phone. It's so convenient. 

No, just open the deer camera's built-in WiFi via the controller and connect your mobile phone to it. then you can set the parameters of the game camera and download the recorded images & videos to your phone.