903001 hobby wing 3A UBEC
Essential part for 250 and 450 Rc-helicopter, it helps supplying a steady power to electronic components of your RC. In addition to this, this small electronic parts can provide backup power even though your esc is suddenly out of order. It can reduce the probability of crash due to electronic malfunction of esc.
250 及 450 之必須品, 它可以幫你的直升機穩定的為各電子零件供電, 特別用處是, 如果電子變速器特然有問題, 他也可以為你的直升機供電, 幫助你救回你的直昇機.