ITEM NAME:30A Brushed ESC Electric Speed Controller Built in 5.7V UBEC with Reverse, Brake img *{margin:0;padding:0;.1 Piece 30A Brushed ESC. Function: forward, reverse, brake. Frequency: 2KHz. Compact and lightweight, easy to install and use. Connector: short red (positive) and black (negative)------battery; long red and black(positive or negative is random)------motor; black red and white three-one line------ch2 of receiver.