The Basic Pack offers a 4-light battery gauge and 7 F-stops of manual control through one or two flash heads. It operates with one main control and an On/Off button for the battery gauge. This pack is for manual exposures or can be teamed up with an Auto Module for an automatic F-stop selection. The very low power settings help with faster film speeds, digital cameras and confined spaces, plus they conserve battery power. The head included in this kit has a 25 watt modeling light, and can handle up to 800 w/s of stored power.