Polaroid Tri-Mode Wireless Camera & Flash Remote (Wireless Flash Remote, Wireless Shutter Release, Wireless Studio Strobe Trigger) For The Nikon D7000, D3100, D5000, D90, D5100 Digital Cameras Uses RF Frequencies For True 300' Range And No Line Of Sight Limitations Enables Off-Camera Mounting Of Flash Without The Annoying Sync Cords Or Wires And Without Losing Any On-Camera Functionality 4 DIP Switches For Setting Pairing Codes And Eliminating Misfiring True Hot Shoe Sync Allows For Full Off Camera Control Of Flash Unit Without Loss Of TTL Functions So Its Ideal For lIght Stands, Flash Brackets ETC. Features Multi Flash Mode For Controlling Up To 16 Flash Units Simultaneously From A Single Transmitter (Additional Recivers Needed)