It will supply a constant 6V all the way through a run, it has a built in switch so easier to wire and fit on the car, it is built with military grade electronics so very reliable and little electronic noise. There's more, just click on the link written above and read. Not cheap, but definitely the best on the market.

I reviewed it a while ago, link is http://www.carsrcracing.co.uk/?p=183

Trev