Used Nikon SU-4 (with SG-2) Wireless Slave Flash Controller 3073
Nikon SU4 Slave Unit – MrCad Online Store
Nikon Su-4 Wireless Slave Flash Controller for sale online | eBay
Nikon Su-4 Wireless Slave Flash Controller for sale online | eBay
Nikon Su 4 Wireless Slave Flash Controller Owner S Manual
Amazon.com : YONGNUO YN560-TX II LCD Flash Trigger Remote Controller for Nikon and YN560IV/III YN660 with Wake-up Function for Nikon Cameras : Electronics