The tether is the upgrade.
Every battery-powered drone you own is a 30–55 minute drone. Halfway through a 4-hour event, you're swapping batteries. Halfway through a 24-hour perimeter watch, you're rotating a fleet.
A tether changes the equation. The cable carries up to 1500 watts of ground power to the drone and an encrypted fibre data link back. The drone can hover at 60–100 m for hours or days — only stopping when you cut the power, not when chemistry says so.
Two product types: tether power systems (CZI, Elistair) that add tethering to a drone you already own; and complete tethered drone systems (TAR, V-SCOUT, Pliabot) shipped as one deployable bundle.