Sensor drones upgrade

What does the second upgrade to the TEC sensor drones do? I get the first upgrade but I can't seem to find why I should spend the resources on the the second.

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It increases time you will see what going on. I think lvl 1 is 15 minutes and lvl 2 is 30. But i forget. It's a great Spy tool. Especially since their ain't nothing the enemy can do about it once you've lunched it.