The Quest External Battery Connector (EBC) is an excellent resource for larger group and classroom launches. The EBC allows you to easily use a more powerful 6-volt alkaline lantern style battery with your Quest launch controller. Simply attach the EBC onto the 9-volt connector of your Q2 launch controller and connect the other end to a standard 6-volt alkaline lantern battery and you're ready for a full day of launching model rockets! Requires a 6-volt alkaline lantern battery (not included).