The VR Pro Duo from Dualsky is a linear voltage regulator offering battery redundancy. It allows for two battery input, and automatically facilitates switching and balancing between the batteries. Designed for 2 x 2S LiPO input and up to 10A constant output current. You have the choice of 5V, 6V or 7.4V output for your servos. The VR Pro Duo comes with four direct outputs, so you can directly connect four channel servos to this unit thus saving the amount of power passing through your receiver. This incorporates double MosFET output, independent linear control IC and high output current capability. Both the input and output ports use high quality tantalum capacitors for protection. Dualsky have also designed the VR Pro Duo to include a low dropout design that makes full use of the cell's capacity, especially in HV mode.

All you have to do is plug and play; there is no need to solder any connectors. For low voltage functionality, there is an internal dual input voltage monitor with memory function. The VR Pro Duo has a minimalist design, featuring input and output ports on horizontal rows. It comes with an FSS-3 safety switch with a status indicator (failsafe position is ON). This FSS-3 is precisely controlled by the built-in MCU, which also regulates the internal voltage. This regulator also supports the FSS-4 lightweight switch and comes equipped with a large heat sink and external cooling fan. This gives it great heat dissipation and high overload capacity. You can use the VR Pro Duo with up to ten 30kg digital HV (7.4V) servos. It is a good choice for large model aircraft (for example, aircraft with 120cc gasoline power).