The Bondtech Heatlink JST XH-2 is an adapter between the thermistor or heater heatlink and the printer. The Heatlink is equipped with a standard Molex micro-fit 3.0 male connector and has a type JST XH-2 as a special connection. This connection is provided with a lock clamp.
You can find the corresponding Thermistor and Heater heatlink cables here: