TLW2-12B is designed for valuable heavy-duty assets that may be disconnected from power some time. When assets are sitting alone, the trackers can be powered by the large built-in battery. It also can be charged by DC power on the assets. A typical scenario is charging the tracker battery when trailers are tethered by trucks.
It’s perfect for a large variety of long-term deployment on industrial and commercial valuable assets such as: dry van trailers, containers, railcars, light and heavy-duty commercial vehicles, heavy equipment, fishing vessels, etc
Source: topflytech.com