It was with an heat sink,and also with speed controller and forward -reverse switch cable This driver board can be fit for DC brush less without hall sensor three-phase motors This item can be used directly, when you got it, wide voltage 5-36V, high power 350W, with heat sink, wire, control switch, so convenient This brush less motor controller features wide voltage high power, suitable for both small motor and large motor. This motor controller has the function of over-current Color: Yellow Material: PC Package Contents: 1 x ESC board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.