The guide number is 28 as per the model designation. It bounces, zooms and swivels. The flash comes complete with a bracket. This unit is compatible with all digital cameras with either built-in flash capability or not. It has a hot shoe so that it can be fired from the camera too. It is fully synchronized with fill-in flash and red-eye reduction flash and can be used with virtually all of the digital cameras on the market. It works as a slave. It can be set for a single flash camera or a pre-flash camera, or, it can detect which setting is best.

I think you can go to camera shops and ask for "Slave Flashes". The fire when your built in flash fires.