Sony FA-WRR1 Wireless Radio Control ReceiverThe Sony FA WRR1 Wireless Radio Control Receiver can help you gain control of your multi camera shoots easily. When coupled with the (optional) FA WRC1M Wireless Radio Commander, you can control up to 15 flashes in 5 groups from up to 98 feet away! This receiver mounts under a single camera flash, waiting for instructions from the Radio Commander. This kind of system allows for remote shutter release for multi angle shots and other flash & exposure