Dualsky VR-Pro Duo High End Linear Regulator (Dual Battery Input)VR Pro Duo Design features: Miniaturisation design, input & output port using horizontal row; Dual battery input design, automatic switching and balancing between batteries; 4 current outputs, support 4 channel servos direct connection; Plug and play. No need to weld the connectors; Internal dual input voltage monitor for low voltage with memory function; Support HV servos (7. 4V), output voltage is switchable; Includes FSS 3, the failure safety