SP Studio Systems SP-72 AC Slave Flash, with a Guide Number 72 for ISO 100.

The SP-72 slave flash is a workhoarse that boosts or fills in with any electronic flash by means of its built in slave. It screws directly into a standard AC socket. Fits into a crowded camera bag and takes on any number of chores in the studio. Great for hair or background lighting. Also a great fill in for copy lights. This slave flash has an ultra sensitive photo slave and a highly visible readylight.