GRANDWATT X7 LINK Light Tower, a mobile light tower which can be powered by an external power source like a power generator, the main or another light tower with built-in generator, it also can be powered by its built-in lithium battery, battery is optional. The main feature of the X7 Link light tower, up to 3 Link towers can be connected in series to a single power source, providing an high illumination area with reduced fuel consumption. For the model with lithium battery, it can light above 5 hours with zero CO₂ emissions and zero noise, zero fuel consumption, zero maintenance.