500 w/s, with wireless radio, 12' AC & 16' sync cables. The Dynalite MP500 500 Watt/Second Power Pack is similar to the RP500/M500XL but includes a built-in Pocket Wizard brand radio slave receiver, and an extra stop of dial-down variability on the main power variator. The built-in 32 channel Pocket Wizard brand radio slave allows you to move around your subject while shooting without getting tangled up in a sync cord.The MP500 has very short flash duration which is useful for stopping action. It also features a short recycle time of less than 1 second, for fast working photographers.Since 1969, Dyna-Lite has been recognized as the strobe equipment with power and performance in a small, lightweight package. Whether it is conventional or digital, in the studio or on location, Dyna-Lite is a very respected name in lighting.