1This set includes 1 transmitter, 2 receivers and 1 sync wire cable. 2Features 433MHz frequency and 16 independent channels. 3With transmission distance up to 30 meters, it boasts strong anti-interference ability, no direction or angle limit. 4Universal hot shoe. Suitable for Canon, Nikon, Olympus, Pentax and other flash units with universal hot shoe. 5The receiver trigger is powered by dry batteries, enjoying a maximum synchronous speed of up to 1/250 seconds.Features:This set includes 1 transmitter, 2 receivers and 1 sync wire cable. Features 433MHz frequency and 16 independent channels. With transmission distance up to 30 meters, it boasts strong anti-interference ability, no direction or angle limit. Universal hot shoe. Suitable for Canon, Nikon, Olympus, Pentax and other flash units with universal hot shoe. The receiver trigger is powered by dry batteries, enjoying a maximum synchronous speed of up to 1/250 seconds. Specification:Condition: 100% Brand NewModel: Metal+Plastic Suitable for:For Nikon SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24For Canon 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX/EXII, 430EZ, 420EX, 420EZ, 380EXFor Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FTFor Olympus FL-50, FL36For Sigma EF-500 DG Super, EF-500 DG ST, EF-430For Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AFm 344D, 333DFor Yongnuo YN-460II YN-468 YN-560 YN-462 YN-465 YN-467Battery for transmitter: 23A 12V mini batter (the battery included)Battery for receiver: 2* 1.5V AAA battery (the batteries not included) Operate frequency: 433MHZOutdoor working distance: up to 30 m / 90 ft (open area, barrier-free)Indoor operating distance: up to 25 m / 75 ftChannel: 16 channelsSync speed: 1/250sColor: BlackPackage Weight: Approx.11.5*9*4cm / 4.53*3.54*1.57inPackage Weight: Approx.111g Package List:1* Transmitter2* Receivers1* Sync Wire Cable1* English Manual Notice:Not suitable for Sony because of its special hot shoe.This flash trigger does not support TTL.Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.Please understand that colors may exist chromatic aberration as the different placement of pictures.