500 w/s, with 12' AC & 16' sync cables. The Dynalite Road Series RP500 500 Watt/Second Power Pack is similar to the Roadmaax pack, but does not have the radio slave. This extremely compact power pack is lightweight, precise and powerful. Power may be adjusted asymmetrically in 1/3 power increments between the three head outlets with the rocker switches and across the board with the two-stop dial variator.The RP500 has a three-way switch for controlling the modeling light -- on full, on in proportion to power, and off. The head outlets are arc-proof -- unplug the heads at will without having to shut down the power pack.The RP500 has a built-in optical and infra red slave. If this pack is used with other strobes, it "sees" the light and fires instantaneously without having to be hard-wired.