There's no battery in this router. So without an external power supply it won't work and will switch off straight away.
You'd have to describe how you plan to use it on a bus, coach, camper van, lorry, boat, etc? And how you plan to power it.
Teltonika offers this battery for continuous operation
Teltonika Uninterruptible Power SupplyThey also have a cigarette lighter connection, but there's nothing to stop it being connected to a 12 or 24V vehicle battery in another way.