This cable is used for connecting an external microphone to your Nikon or Canon DSLR cameras or camcorders that have a 3.5mm mic jack. This is compatible with most professional external microphones. This is compatible with Rode, Boya, Mova, Takstar, Comica, Sairen and similar microphones. These external mics significantly reduces noise from being recorded giving better quality DSL or camcorder recordings. NOTE / PLEASE READ: This is not compatible with smartphones. This cable is specifically designed to connect DSLR and camcorders to external cameras with 3.5mm jack. Specifications: 3.5mm TRS male to 3.5mm TRS Male patch cable cord wire. This cable is known as TRS to TRS patch adapter cable, cord or wire or simply TRS to TRS DSLR adapter.