The connector is a female to female block that helps charge your support cell via a charger or a USB cable
Exposure Piggyback Support Cell Charger ConnectorA small but convenient part that connects a charger or USB cable to a support cell for charging.FeaturesHelps connect a charger to a USB support cellFemale to female blockBuy Exposure Accessories from Chain Reaction Cycles. Ride. Eat. Sleep. Repeat.