This is a Nikon 10 pin round to 1/8 stereo male connector cable.  It is the perfect accessory for your camera, a drone, or photo equipment. Originally intended to provide the means for a remote shutter trigger, such as a shutter beam.

With a length of 3 ft, this coiled cable is brand new and still in its plastic wrapping. It allows you to connect devices with a 2.5 mm jack male connector to those with a 10 pin connector A, without any need for a split or duplication. This cable is ideal for those who want to transfer images and videos with ease. It is compatible with a wide range of cameras, drones, and photo equipment.

In a word - RARE.