The Hasselblad Radio Transmitter (56154) and Receiver (56162) work together to remotely fire a Hasselblad EL-style camera, which might be handy if remotely firing EL-style cameras is what you need to do. The other thing that the Hasselblad Remote Transmitter and Receiver do is give you the opportunity to cosplay a 1960s terrorist threatening to blow up the World's Fair, because boy does this black-box-and-antennas setup ever look suspicious. With boxes.