The 1S DC-DC BOOSTER is a DC-DC power booster module which can draw power from a 1S LiPo battery, then boosts it to the voltage level (6V) that suits the receiver & servo and provides continuous output current up to 3Amp.
It is mainly applied in 1/12th / 1/10th on road scale RC vehicles. 1/12th scale cars usually use a 1S Lipo battery...