Multiplex ROXXY BL-Control 725 S-BEC 4D ESCROXXY BL Control 725 S BEC 4D. This version allows a change of rotation of the direction of rotation of the fast motor, hence the name 4D The new generation of MULTIPLEX ROXXY BL Control 7xx BEC controllers is ideal for brushless motors with 5 to 10 12 NC NiMH or 2 4S LiPo elements. The brake can be disengaged by programming, the cut out in the event of low voltage, the motor timing and the type of starting are each adjustable to three values This