Features: This set is composed of a signal transmitter and 4 trigger receivers. Universal hot shoe interface, compatible for Canon, for Nikon, for Sigma, for Olympus, for Pentax, etc. Globally universal 433MHz frequency, 16 channels. With studio flash interface, can trigger several kinds of studio flashes. Transmitting distance up to 30M, no limits with directions or angles. 1/4" nut can be connected with tripod or light holder to make flashlight safe and stable. Energy-saving design with 12V 23A battery of transmitter and 2 * AAA batteries(not included) of receivers. Comes with a PC sync cord for cameras. Specifications: : Material: Metal + Plastic Color: Black Suitability: -For Nikon SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24; -For Canon 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX/EXII, 430EZ, 420EX, 420EZ, 380EX; -For Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT; -For Olympus FL-50, FL36; -For Sigma EF-500 DG Super, EF-500 DG ST, EF-430; -For Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AFm 344D, 333D Power of transmitter: 23A 12V mini battery(included) Power of the receiver(AC): 2 * 1.5V AAA Alkaline Battery(not included) Outdoor working distance: max. 30m / 90feet (open area, no fraise) Indoor operating distance: max. 25m / 75feet Channel: 16 channels Frequency: 433Mhz Sync. Speed: Max.1/250s Package Size: 13.5 * 10 * 4cm / 5.3 * 3.9 * 1.6in Package Weight: 183g / 6.5oz Package List: 1 * 4-Channel Transmitter 4 * 4-Channel Receiver 1 * PC Sync Cord(2.5mm to PC) Note: This trigger set do not support TTL function. This item only includes the trigger set and sync cord.