The dash cam for car can withstand extreme temperatures from -4°F to 158°F (-20°C to 70°C). It is normal for the camera to run slightly hot, especially with 3-channel recording, as its typical operating temperature range is 86°F to 122°F (30°C to 50°C). 

Yes, the small built-in battery is used to save setting and time, and parking monitor. It won't last too long, so when the car camera is recording it needs to be continuously connected to the power supply. 

This uber dash cam can use high quality U3 above 32~128GB Micro SD card. please kindly format the SD card when first use. 

The dual dash cam can record video with the screen turned off while you use the screensaver feature, it won't distract the driver and protect privacy. If you want the dash cam records video with screen turn on, just turn off the screensaver feature. 

If it’s a WiFi issue, just put a wireless router or hotspot inside the hanger with the console. But you are probably talking about the 433 MHz RF signal between the sensor and console. My sensor is located above a patio roof with 26 gauge corrugated steel roofing and it works fine through that and a house wall. You can try moving the sensor and console closer together, even if the console needs to be out of site in the rafters. You can then view your data from whatever weather website you connect to.