The Twin Chargers were the tools carried by Dalu on Voya Nui. They were given to her by Karzahni when she was sent to him to be repaired. They could increase the attributes of a chosen target. They could be used to increase the speed or strength of her allies, or use them against enemies. It took up so much of her energy to use them that doing so could leave her feeling weakened to the point of near-death.