Comes with instructions
Is used with internal regulator, and is not a stand alone external regulator.
Your electrical system is too important to your automobile to be left to chance - cut out the guessing and the worry with the new XS Power VCM!
You'll gain pinpoint control of the voltage running through your system with the VCM's patented technology. Whether you use it for racing, mobile audio or your own unique application, you'll see increased versitility out of your equipment as you precisely control the flow of power. The VCM has a range of 14.5 to 15.2 volts for 12 volt batteries and 15.3 to 19.5 volts for 14 and 16 volt batteries.
The VCM is easy to install and even easier to use. With the VCM in hand, you'll be in control in no time - right from your driver's seat. It's the part of your electrical system you didn't realize you were missing until now!