Neewer 4 Channel Wireless Studio Flash Trigger Set for Canon,Nikon,Pentax,Olympus DSLR Series,with Receiver for Neewer Godox CowboyStudio StudioPRO Strobe Monolight and External Speedlite(AC-04) This set is designed for photographic studio and on-location work to trigger various flash lights The transmitter is attached on the hot shoe of the camera while the receiver is plugged into the studio flash It has standby indicator and trigger signal indicators Super strong anti-interference ability, sensitive reaction ability, convenient to operate Circuit design has the function of standby sleep, low power consumption