“RPM Cable ( Power&RPM Module )”. The adapter cable is used in combination with the Add-On Power&RPM module that can be connected to either the RC Logger PRO, RC Logger HD2, HD or RC Logger LC. Use this adapter to insert between the brushless motor connector. The connector is non-reverse-able. Cable length is 21.50 cm. Use as replacement for original cable that came with the Power&RPM module.