This is the standard BlackVue rear connecting cable that connects a front camera to its rear camera, available in 6 meters (20 feet) and 15 meters (49 feet).
The Coaxial cable for the DR970X/DR770X is fully compatible with all DR900 and DR750 models as well.
Note that this cable may not fit all BlackVue dash cams. Unsure which cabling is compatible with your camera? Check out our compatibility list here.