About 30 feet 

it fits in a 100 mm square filter mount, so it depends on the size of the mount adapter to the lens 

First, you need to check whether the camera battery is sufficient. When the battery is below 30%, you cannot take pictures at night. You can see the battery in the lower right corner of the camera screen; then format the memory card; find the delay in the menu Take pictures, note that the factory default setting is 30 seconds, but if the animal stays in front of the camera for less than 30 seconds, the picture will not be taken. You can try to set it to 8 seconds, 5 seconds, etc. 

first 30 days is free then I believe it's $7-10 a month 

This means that the magnification can be adjusted from 10 to 30 times, the objective lens is 50mm, a great telescope, light and durable.