Hendrickson WATCHMAN advanced trailer wheel-end sensor technology delivers real‑time, actionable wheel-end and tire condition insights, giving fleets the data needed to make informed maintenance decisions and improve uptime. The technology detects slow leaks, major leaks, and low-pressure events using Bluetooth hubcap‑mounted sensors, receiver, and the WATCHMAN mobile app to create a smart trailer wheel‑end insights platform. A long‑life, high‑capacity battery is engineered to last the life of the system requiring no replacement or service.