Originally Posted by SLOWINSLOWOUT

I own one. The servo to use(that will fully utilize the M12 capabilities) is the Sanwa SRG-HS(94972). It is rated for one cell use, nominal voltage input 3.7V.

The M12 displays receiver voltage, it is battery voltage when using the vortex with one cell. Unless there is a setting for the bec that I have not found, it does not have a booster circuit.