WiFi Wildlife Trail Camera with Night Vision 0.4S Trigger Motion Activated 24MP 1296P IP65 Waterproof for Hunting Camera & home security

SKU: KF35.007

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My camera been recording for over 4 months now and we haven’t changed the battery, still has 69% battery life left, 
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No it has nothing to do with home wifi. It just links to your phone. I would call it more like Bluetooth rather than wifi 
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Yes, as long as you are in close proximity to the camera 
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It does not need an existing WIFI network. The Unit itself generates its own "hotspot" to connect to your phone wirelessly - functions similar to connecting via bluetooth, but uses WIFI instead to be able to download photos faster. 
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Theoretically yes you could extend the wifi, get a wifi extender unit, setup wifi with same wifi info as from camera. Connect wifi unit to camera then connect phone to wifi. Extended! Basic Setup info and it’s not for someone who doesn’t know what they are doing. Do your research first before just attempting.