The Pro-Series 2.4 G Hz Wireless Receiver is for use with the Calumet 4-Channel Wireless Trigger Kit (CF0094). When used in conjunction with a transmitter (sold separately), the receiver can trigger Nikon flashes, strobes, or can be used as a wireless shutter-release for your camera. The Receiver can be mounted by it's cold shoe or one a 1/4"-20 mount using the metal threaded socket.