The PG15S features a unique swing away diffuser that provides softer lighting, and reduces light output by 1/2 f-stop. It recycles in 6 to 8 seconds. The light can be positioned vertically, horizontally or at 45-degree angles up and down. Has a built-in slave, test button and 1/4 x 20 socket for use on light stands or PG820MT Mini-Tripod. The unit uses 2 AA batteries (not included).