I use them on several FXT Black Knight VTxs. With an output of 200mW, zero airflow, they can be handheld. Comes with a large quantity of double sided tape in the desired width (cut to length). Cut the shrink wrap from the VTx, remove the label if there is one, clean the VTx's contact surface and wipe the heatsink with alcohol before gluing them together. Put a small weight on the radiator and let it stand for a while. Check the temperature with a thermometer. Enjoy!