In Bloons TD 6, this is the 1st upgrade of Path 2. This upgrade also allows the Sniper Monkey to detect Camo Bloons but additionally allows the Sniper Monkey to deal +2 damage to Camo Bloons. It costs $255 on Easy, $300 on Medium, $325 on Hard and $360 on Impoppable.
While it is a alright upgrade, overall, the power from the Top Path is better for the Bottom Path Sniper, while for Top Path the Bottom Path adds more speed to the Sniper.
On Easy difficulty, you can take care of pretty much all Camo bloons with one sniper from the top path and one from the bottom path, both with Night Vision Goggles (so 3-1-0 on Strong and 0-1-4 on First, for instance). Upgrade them to 3-2-0 and 0-2-4 and they can handle all camos on Medium difficulty, as well. You'll need a lot more firepower to handle round 78, though, making this strategy unfeasible for Hard difficulty or higher.
In both BTD5 and 6, the Night Vision Goggles will be worn for any other extra upgrades bought except Tier 5s.
The Bloons Monkey City Artwork does the angry eye when she peers in the binoculars but in contrast in BTD5, it doesn't do that.
In BTD6, the description for the Night Vision Goggles was modified in Version 11.0 from "Allows the sniper to detect and shoot Camo Bloons." to the new description to fit the addition of the new bonus damage to Camo Bloons.
This is the first upgrade in BTD6 that does increased damage to a bloon with a special property other than Fortified, Lead, Ceramic, or MOAB-class.