This is a mono, or phono plug system.
SSR systems let you fire your slaved strobes without triggering flash. No need to hook up a PC cord to the main flash or use a camera-mounted strobe; the SSR transmitter replaces them both. Mount the compact transmitter on your hot shoe, or connect it to the camera PC terminal ; each time you shoot, the SSR transmitter fills the studio with an invisible pulse of light.
A super-sensitive SSL Ultra Slave picks up the signal from any direction and fires the main flash, which in turn triggers all other slaved strobes in the setup. Simple, reliable, professional.
Picks up signals from up to 100' away.
A 9V battery (not included) in the transmitter powers up to 100,000 shots. With a fresh battery, transmitter recycle times average less than 1 second, so yo'll never miss a shot.