PT-04 NE Wireless Flash Trigger & Umbrella Holder for Canon Nikon Pentax 1 x 4 channel Trigger Transmitter (with 23A 12V battery installed inside) 1 x PT-04 NE Receivers (with umbrella holder) Suitable for Olympus FL-50R, FL-50, FL-36R, FL-36; Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT;Sigma EF-530 DG Super, EF-500 DG Super, EF-430; Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AF, 344D, 333D;Vivitar 285HV, DF-400MZ, DF-340MZ, 2700; Suitable for Nikon SpeedLite SB900 SB-800 SB-600 SB-28 SB-27 SB-26 SB-25 SB-24 Suitable for Canon SpeedLite 580EX II 580EX 550EX 540EZ 520EZ 430EZ 430EX 430EX II 420EX 420EZ 380EX