The Nocturnal Lights M700i Underwater LED Video Light System with 2" Flex Arm & 1/4"-20 T-Base is designed for housings (eg. Ikelite's DSLR housings) with a 1/4" thread on top of the housing instead of a hot shoe. It includes all the accessories required to mount the M700i Underwater Video Light directly on top of the housing.
The ultra compact M700i Underwater Video Light can be directly mounted onto your housing or arm by using the YS or ball joint adapters (sold separately). The light uses a twist on and off mechanism with two power settings, allowing you to switch between high and low output each time you turn the light on and off.