This unit allows the following connections:

1 x feed straight through, allowing a flash gun to mount to top of unit, ie on top of camera

2 x PC SYNC cord Female Plugs, allowing 2 remote units typically using a Male to Male cable
1 x PC SYNC cord Male Plug, allowing a remote unit typically using a female to male extension cable.

All connectors can be used simultaneously, giving a possible total of 4 flash units from one unit. You should be able to daisy chain unit to give more than four units, but it will depend on your equipment, and voltage drops across the equipment and cables.

Also includes a "test" button on the fourth side to allow you to test or manually fire all attached guns.

WARNING

Please make sure that your flash equipment is cross compatible. For example, combining a flash gun with a trigger voltage of 120 volts with a similar gun of trigger voltage of 3 volts is most likely to cause damage. Typically there are two types of flash gun - high trigger voltage (older guns) and low trigger voltage (typically new flash guns). You can measure trigger voltage with a simple multimeter.

If you are using this adaptor for just one remote gun, or up to 4 identical guns, then compatibility will not be a problem.