The flash standard hot shoe on the top is perfectly fit for off-camera flash, microphone, studio light other equipment or devices with standard ISO 518 hot shoe excepts Canon
Optical Sensor: Optical flash slave trigger for lag-free firing of a second flash unit. For shoe-mount flash units-no cord required
The PC female outlet on the side, enabling you to trigger flash mounted onto the upper hot shoe and additional flash or studio light (A sync cable is excluded)
The standard cold shoe on the bottom is compatible with DSLR, mirrorless digital camera, camcorder and other cameras with standard hot shoe
The 1/4"-20 Tripod Socket can be mounted onto a tripod with a 1/4"-20 male screw. And the lock nut helps you mount the devices tightly