Cable for power supply all of on-camera lights from some of  Swit batteries equipped with a socket for light.

This cable fits to the following batteries:

S-8972 (equivalent of Sony NP-F970)
S-8845 (equivalent of Canon BP-970G)
S-8D62 (equivalent of Panasonic D54S)
S-8BG6 (equivalent of Panasonic VW-VBG6)
S-8823 (equivalent of JVC BN-VF823)