"This service is designed to connect Cobb and extend the access that the library already provides the Cobb Community further into the internet," according to the library website, where you can read more.
You rent the T-Mobile devices for seven days if you are a Cobb County resident who already has access to the library internet with your library cards. The rentals are not renewable, and overdue fines are a dollar a day. You can connect up to 10 devices a day and the download speed is about 12 megabytes per second. The battery should last you about six hours.