Specifications: Built-in 2.4G wireless X system; Delay emission: 0.01 - 30 seconds; ID function: OFF; 01 - 99; Installation Method: 1/4 - 20 female thread; Color Temperature: 5600K (±200K); Strobe Flash: Max 90 times, 99Hz; Connector: 3.5 mm sync input, wireless control port; Stable color mode: 5 in full power range 600°±100°K; Flash exposure compensation: ±3 levels in 1/3 increments; Built-in slave cells: S1 and S2 light slave mode, 2.4 GHz wireless system; Optical slave for Canon, Nikon, Sony, Olympus, Panasonic, Fujifilm, Pentax