Description guide number: 38(105mm iso 100) flash mode: m, s1, s2 power regulation: /16, 1/32, 1/64, 1/128 vertical rotation angle: 0-90° horizontal rotation angle: 0-270° power supply: 4*aa alkaline/ni-mh batteries(not included) flash time: 100-1500 times recycling time: approx. 0.1-5s light quantity output control: with 1/8 stops increment color temperature: 5600k±200k flash duration: 1/300s-1/20000s dimension: 190x75x55mm weight: 500g compatible with: all dslr cameras with a standard hot shoe, such as nikon, canon, pentax, olympus, etc, except for sony and minolta, because they use a different hot shoe.