The compact body has a large amount of light with guide number of 22. The fly eye dome lens is used. Submersible illumination angle, 140° horizontal x 100° vertical super wide beam Reliable S-TTL auto, 12 stage "manual luminous" Large wheel dial for improved maneuverability. The luminous panel provides increased visibility, and uses a double o-ring. Significantly reduces the risk of water intrusion; Ball arm mounting base is positioned forward for increased lighting freedom; Uses 4 AA batteries that are easy to get and reasonable; Compatible with various strobe dome filters; Supports quick holder that can be easily removed with one touch.