DC air pump opreated by 4 "D" cell batteries (battery sold separately) DC air pump operated by 4 "D" cell bateries (battery sold separately) Reversible for both inflatation and deflation Handheld and portable design come with 3 different nozzle adapters can come from 1/4" to 1-1/4" valve fast inflation and deflation, ideal for indorr and out door use