Here is a security camera that you can use in areas where WiFi signal is not great. The EZVIZ EB8 4G is a pan & tilt 4G LTE battery powered camera with 2K resolution, smart human motion detection, color night vision, 2-way audio, and siren/strobe light.
This camera has a weatherproof design. It can handle MicroSD cards up to 512GB. It runs on a 10400mAh battery that can be charged with a solar panel. The EB8 4G has customizable motion detection zones. It is Alexa and Google friendly.