This cable is an essential accessory designed to interface with various bio-sensing applications and projects. It is equipped with a standard 3.5mm audio jack on one end and three snap style recepticales for biomedical sensor pads at the other end. The cable itself measures 24″ and is made of extremely flexible silicone wire. Each cable has three conductors (red / blue / black) and is compatible with the SparkFun Single Lead Heartrate Monitor. Alternatively, it can also be used with a 3.5mm Breakout Board to connect to other devices.