Specifications: Brand: Andoer Material: Plastic + Metal Receiver: 6pcs Transmitter: 1pcs 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 -For Andoer AD-560II -For Neewer TT560 Outdoor working distance: max. 30m / 98.4feet (open area, no fraise) Indoor operating distance: max. 25m / 75feet Working Frequency: 433MHz Battery for Transmitter: 23A 12V Mini Battery(Included.) Battery for Receiver: 2 * AAA Alkaline Battery (Not included.) Package Size: 16.5 * 12.5 * 4.7cm / 6.5 * 4.9 * 1.8" Package Weight: 258g / 9.1oz Package List: 1 * Transmitter 6 * Receiver 1 * SYNC Cord (2.5mm to PC) 1 * User Manual(English) Note: Battery for receiver is not included.